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View Full Version : RPM Tach doesnt work.

AznDrftr.
11-18-2007, 06:36 AM
Okay, quick history on the car. Its a buddies of mine.

89 240sx
SOHC to a DOHC swap.
Changed clusters to DOHC

I believed it did work at one point, but if im not mistaken, i think it didnt. It just doesnt move. It just sits there. What could it be?

What we've tried:

Replace the whole cluster with a workin one, and still no results.

Any thoughts please.
S14DB
11-18-2007, 06:54 AM
What is the Redline on the "working" cluster?
AznDrftr.
11-18-2007, 07:06 AM
What is the Redline on the "working" cluster?

the same as a DOHC.
Folken
11-18-2007, 08:15 AM
when you did the swap I'm guessing you have to swap the ecu, check the red/yellow wire(I'm pretty sure thats the tach signal) is connected and not grounding out somewhere... and just make sure you have a dohc tach, the sohc redlines at 6,500 and dohc is 7,000(I'm pretty sure it's 7k I'm too lazy to go outside and check)
AznDrftr.
11-18-2007, 10:06 AM
^LOL. yea thanks a lot, i will double check for the ecu bro. And lol at being lazy, but yea your right

SOHC- 6K | DOHC- 7K
AznDrftr.
11-20-2007, 08:14 AM
any other thoughts on this.

I checked the yellow.red wire, and its connected, so its seems good. However, i did follow it, and it ends in this little connector, only that its like a closed connector.
DALAZ_68
11-20-2007, 09:05 AM
any other thoughts on this.

I checked the yellow.red wire, and its connected, so its seems good. However, i did follow it, and it ends in this little connector, only that its like a closed connector.

you do know ur not suppose to connect ALL the wire right?

some of the sensors are different

hmmm

might wanna check the connection on the tranny aswell...

maybe unplugged or wire might have rotted off...happend to me, nothing like a 3 dollar solder kit couldnt fix