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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 08-12-2014, 06:36 PM   #1
teddyjr
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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!
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Old 11-20-2014, 09:17 PM   #2
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bumping old tread. I would like to see the location of the adjustment screw as well.
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Old 11-20-2014, 09:30 PM   #3
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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.
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Old 12-29-2014, 11:27 PM   #4
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Anyone know if this method will work for s15? Or if s15 has a potentiometer as well?
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Old 12-29-2014, 11:39 PM   #5
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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.
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Old 12-30-2014, 04:37 PM   #6
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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?
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