can't get my tach to work!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

bahlorm · 07-28-2014, 11:31 AM

Hey everyone new member here. I have a 1990 240sx that was pre-built with an sr20det. I bought it from a friend of mine who bought it from the builder. My friend said that he was driving down the road and his whole gauge cluster went out at the same time. He bought a new cluster which didn't fix the problem. I just went ahead and ordered new gauges and I'm trying to wire them with no luck. I was told the red and yellow wire going to the ecu is the tach signal but there's no signal coming from it that my aftermarket or even old tach registered. I also tried a white wire that I was told is the cas wire which also has no signal. All my fuses are good. I'm at a loss on what to do.

demi.colwell · 08-02-2014, 12:49 PM

Bumping.. Still getting no where with this.

bahlorm · 08-03-2014, 08:39 AM

Little bit of an update with this. I got my water temperature gauge wired up and working properly.. Tach still has no reading at all, wired directly to the yellow/red coming out of the ecu.

*brndck* · 08-03-2014, 08:51 AM

you just grabbed a random yellow/red wire? did you bother looking at an ecu pin-out to make sure its correct? what tach are you using? some aftermarket tachometers require using a pull-up resistor, or a tach adapter like the one autometer makes.

demi.colwell · 08-03-2014, 09:04 AM

No I used a pin out and used the tach signal wire. I believe number 3 pin. I am using this cheap 4 in 1 tach. Got the water temp to work on the gauge. My stock gauges also didn't work. Since I autocross this not having any gauges at all was worrying me a bit.

*brndck* · 08-03-2014, 09:26 AM

Quote:

Originally Posted by demi.colwell

No I used a pin out and used the tach signal wire. I believe number 3 pin. I am using this cheap 4 in 1 tach. Got the water temp to work on the gauge. My stock gauges also didn't work. Since I autocross this not having any gauges at all was worrying me a bit.

Soooooooo maybe look into figuring out why the stock ones don't work instead of using aftermarket ones as a bandaid?

jr_ss · 08-03-2014, 10:54 AM

Yeah, god forbid you do some investigative work to repair broken shit.

These don't work, I'll just buy another gauge...

demi.colwell · 08-03-2014, 04:41 PM

Because if it was possibly a cluster problem then some new gauges would of solved my issue. Plus if it was anything to due with the wiring under the dash I can eliminate that by trying to connect it straight from the ecu. I'm not an electrician and I'm far from a mechanic. Which is why I come on here for assistance on what could be going on.

jr_ss · 08-03-2014, 06:41 PM

There I obviously an issue some where. You have to trace the cluster wires anyway, so why not see it there is something screwed up in the original wiring.

Trap Star · 08-03-2014, 08:16 PM

Sure you got the right wire? There's two red and yellow wires right next to each other.

One is Red with a Yellow stripe.
One is Yellow with a Red stripe. This is the tach signal wire.

It would be pretty easy to mix them up.

lucas240sx · 02-28-2015, 10:14 PM

Ok I'm going to bump this old thread so I don't have to start another one
I've been searching on the for hours now

I have a 89 s13 with sr swap
When I put in a working tach....it will work for about 15min- 20 min then just stops working
Why?

I know the yellow/red wire is for tach.....I tried to trace the wire from dash plug/ecu pin through the engine harness (spare harness that's been cut up), looks like it goes towards the plugs by the stock battery location?

I've read ppl just connect a wire from the tach to the ecu.....which sound no different from the factory route?
Or connecting to the cas 180° white wire

I hope someone can help me with this

bahlorm · 03-01-2015, 05:24 AM

Connecting it to the white cas sensor didn't work for me. I had to run a wire to the ecu.

lucas240sx · 03-01-2015, 08:30 AM

I don't understand why that would work when a wire is already going from the ecu all the way to the plug on the back of the cluster

Are you putting a wire from the screw on the cluster to the ecu?

bahlorm · 03-01-2015, 08:50 AM

I have an aftermarket tach. My whole cluster wasn't working. But if your tach was working then just stops randomly I would assume something would be involved in a loose wire.

lucas240sx · 03-01-2015, 10:12 AM

The whole cluster works
Once I did see smoke coming from behind the cluster and tach stoped working

Tried another cluster....tach worked
While I was adjusting the cas, I went to check the tach and again it stopped working

They never work again Untill I put a new one in

lucas240sx · 03-01-2015, 03:57 PM

Does anybody have any input in this matter?

lucas240sx · 03-03-2015, 09:16 AM

Bump anyone

07-28-2014, 11:31 AM	#1
bahlorm Leaky Injector Join Date: Jul 2014 Location: charlestown indiana Age: 31 Posts: 55 Trader Rating: (0) Feedback Score: 0 reviews	can't get my tach to work!! Hey everyone new member here. I have a 1990 240sx that was pre-built with an sr20det. I bought it from a friend of mine who bought it from the builder. My friend said that he was driving down the road and his whole gauge cluster went out at the same time. He bought a new cluster which didn't fix the problem. I just went ahead and ordered new gauges and I'm trying to wire them with no luck. I was told the red and yellow wire going to the ecu is the tach signal but there's no signal coming from it that my aftermarket or even old tach registered. I also tried a white wire that I was told is the cas wire which also has no signal. All my fuses are good. I'm at a loss on what to do.

08-03-2014, 10:54 AM	#7
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,056 Trader Rating: (34) Feedback Score: 34 reviews	Yeah, god forbid you do some investigative work to repair broken shit. These don't work, I'll just buy another gauge... __________________ My SR20VET

08-03-2014, 06:41 PM	#9
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,056 Trader Rating: (34) Feedback Score: 34 reviews	There I obviously an issue some where. You have to trace the cluster wires anyway, so why not see it there is something screwed up in the original wiring. __________________ My SR20VET

08-03-2014, 08:16 PM	#10
Trap Star Zilvia Junkie Join Date: Jan 2008 Location: ATL/Sylva, NC Age: 33 Posts: 409 Trader Rating: (0) Feedback Score: 0 reviews	Sure you got the right wire? There's two red and yellow wires right next to each other. One is Red with a Yellow stripe. One is Yellow with a Red stripe. This is the tach signal wire. It would be pretty easy to mix them up. __________________ 86 300zx/90 240sx/97 240sx/96 LS400/03 350z -Shake N' Break Racing-

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08-02-2014, 12:49 PM	#2
demi.colwell Join Date: Jul 2014 Posts: 23 Trader Rating: (0) Feedback Score: 0 reviews	Bumping.. Still getting no where with this.

08-03-2014, 08:39 AM	#3
bahlorm Leaky Injector Join Date: Jul 2014 Location: charlestown indiana Age: 31 Posts: 55 Trader Rating: (0) Feedback Score: 0 reviews	Little bit of an update with this. I got my water temperature gauge wired up and working properly.. Tach still has no reading at all, wired directly to the yellow/red coming out of the ecu.

08-03-2014, 09:04 AM	#5
demi.colwell Join Date: Jul 2014 Posts: 23 Trader Rating: (0) Feedback Score: 0 reviews	No I used a pin out and used the tach signal wire. I believe number 3 pin. I am using this cheap 4 in 1 tach. Got the water temp to work on the gauge. My stock gauges also didn't work. Since I autocross this not having any gauges at all was worrying me a bit.

08-03-2014, 04:41 PM	#8
demi.colwell Join Date: Jul 2014 Posts: 23 Trader Rating: (0) Feedback Score: 0 reviews	Because if it was possibly a cluster problem then some new gauges would of solved my issue. Plus if it was anything to due with the wiring under the dash I can eliminate that by trying to connect it straight from the ecu. I'm not an electrician and I'm far from a mechanic. Which is why I come on here for assistance on what could be going on.

02-28-2015, 10:14 PM	#11
lucas240sx Zilvia FREAK! Join Date: Sep 2006 Location: shawnee,okl Age: 34 Posts: 1,299 Trader Rating: (16) Feedback Score: 16 reviews	Ok I'm going to bump this old thread so I don't have to start another one I've been searching on the for hours now I have a 89 s13 with sr swap When I put in a working tach....it will work for about 15min- 20 min then just stops working Why? I know the yellow/red wire is for tach.....I tried to trace the wire from dash plug/ecu pin through the engine harness (spare harness that's been cut up), looks like it goes towards the plugs by the stock battery location? I've read ppl just connect a wire from the tach to the ecu.....which sound no different from the factory route? Or connecting to the cas 180° white wire I hope someone can help me with this

03-01-2015, 05:24 AM	#12
bahlorm Leaky Injector Join Date: Jul 2014 Location: charlestown indiana Age: 31 Posts: 55 Trader Rating: (0) Feedback Score: 0 reviews	Connecting it to the white cas sensor didn't work for me. I had to run a wire to the ecu.

03-01-2015, 08:30 AM	#13
lucas240sx Zilvia FREAK! Join Date: Sep 2006 Location: shawnee,okl Age: 34 Posts: 1,299 Trader Rating: (16) Feedback Score: 16 reviews	I don't understand why that would work when a wire is already going from the ecu all the way to the plug on the back of the cluster Are you putting a wire from the screw on the cluster to the ecu?

03-01-2015, 08:50 AM	#14
bahlorm Leaky Injector Join Date: Jul 2014 Location: charlestown indiana Age: 31 Posts: 55 Trader Rating: (0) Feedback Score: 0 reviews	I have an aftermarket tach. My whole cluster wasn't working. But if your tach was working then just stops randomly I would assume something would be involved in a loose wire.

03-01-2015, 10:12 AM	#15
lucas240sx Zilvia FREAK! Join Date: Sep 2006 Location: shawnee,okl Age: 34 Posts: 1,299 Trader Rating: (16) Feedback Score: 16 reviews	The whole cluster works Once I did see smoke coming from behind the cluster and tach stoped working Tried another cluster....tach worked While I was adjusting the cas, I went to check the tach and again it stopped working They never work again Untill I put a new one in

03-01-2015, 03:57 PM	#16
lucas240sx Zilvia FREAK! Join Date: Sep 2006 Location: shawnee,okl Age: 34 Posts: 1,299 Trader Rating: (16) Feedback Score: 16 reviews	Does anybody have any input in this matter?

03-03-2015, 09:16 AM	#17
lucas240sx Zilvia FREAK! Join Date: Sep 2006 Location: shawnee,okl Age: 34 Posts: 1,299 Trader Rating: (16) Feedback Score: 16 reviews	Bump anyone