RB25DET Tachometer Recalibration for S14 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

teddyjr · 08-12-2014, 06:36 PM

In my pre-made RB25DET-to-S14 conversion harness, Wiring Specialties provided a how-to for recalibrating the S14 tach. The ECU shows 900RPM and the tach reads 1100ish. Anyway, the instructions read, "...The adjustment screw will be in the back of the tach-no need to take the face of the gauges is needed..."

Aside from the freaky grammar, this seems straightforward, but before I pull the tach I thought I'd ask if anyone has a photo showing the location of the potentiometer trim screw? I'd rather know what I'm looking for before pulling the cluster back out. Mr. Google (web and images), and Zilvia/Nico search have revealed nothing of value.

Thanks in advance!

rodneyfromtrini · 11-20-2014, 09:17 PM

bumping old tread. I would like to see the location of the adjustment screw as well.

Yellow4g63 · 11-20-2014, 09:30 PM

I adjusted my S14 tach and you won't see it untill you take out the tach from the cluster and jumper it to make it work while you adjust it. small phillips screw.

Steve15 · 12-29-2014, 11:27 PM

Anyone know if this method will work for s15? Or if s15 has a potentiometer as well?

feito · 12-29-2014, 11:39 PM

i dont know, but if my mind serves me right, on my 98 i didnt use jumper wires, i just removed the speedometer and gained access to the adjustment screw. And if I remember correctly, some earlier s14's have the adjustment screw on the back.

Steve15 · 12-30-2014, 04:37 PM

S15 doesn't have anything like that on the cluster, I checked

Sorry to thread jack, but does anyone know how to make RB25 tacho work for s15?

08-12-2014, 06:36 PM	#1
teddyjr Zilvia Junkie Join Date: May 2012 Location: St Petersburg, FL Posts: 306 Trader Rating: (13) Feedback Score: 13 reviews	RB25DET Tachometer Recalibration for S14 In my pre-made RB25DET-to-S14 conversion harness, Wiring Specialties provided a how-to for recalibrating the S14 tach. The ECU shows 900RPM and the tach reads 1100ish. Anyway, the instructions read, "...The adjustment screw will be in the back of the tach-no need to take the face of the gauges is needed..." Aside from the freaky grammar, this seems straightforward, but before I pull the tach I thought I'd ask if anyone has a photo showing the location of the potentiometer trim screw? I'd rather know what I'm looking for before pulling the cluster back out. Mr. Google (web and images), and Zilvia/Nico search have revealed nothing of value. Thanks in advance!

11-20-2014, 09:30 PM	#3
Yellow4g63 Zilvia FREAK! Join Date: Jan 2003 Location: Socal Posts: 1,451 Trader Rating: (5) Feedback Score: 5 reviews	I adjusted my S14 tach and you won't see it untill you take out the tach from the cluster and jumper it to make it work while you adjust it. small phillips screw. __________________ 95 240sx RB20 415whp 91 Nx2000 VVL yo

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11-20-2014, 09:17 PM	#2
rodneyfromtrini Leaky Injector Join Date: Mar 2010 Location: NJ Age: 32 Posts: 145 Trader Rating: (1) Feedback Score: 1 reviews	bumping old tread. I would like to see the location of the adjustment screw as well.

12-29-2014, 11:27 PM	#4
Steve15 Join Date: Apr 2012 Location: Okinawa, Japan Age: 29 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	Anyone know if this method will work for s15? Or if s15 has a potentiometer as well?

12-29-2014, 11:39 PM	#5
feito Nissanaholic! Join Date: May 2007 Location: Texas Posts: 1,948 Trader Rating: (1) Feedback Score: 1 reviews	i dont know, but if my mind serves me right, on my 98 i didnt use jumper wires, i just removed the speedometer and gained access to the adjustment screw. And if I remember correctly, some earlier s14's have the adjustment screw on the back.

12-30-2014, 04:37 PM	#6
Steve15 Join Date: Apr 2012 Location: Okinawa, Japan Age: 29 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	S15 doesn't have anything like that on the cluster, I checked Sorry to thread jack, but does anyone know how to make RB25 tacho work for s15?