RPM Gauge on TPI
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Member
Joined: Feb 2008
Posts: 190
Likes: 2
Car: 1987 IROC
Engine: 5.0 TPI all stock
Transmission: T5
Axle/Gears: G92 G80
RPM Gauge on TPI
Ok i searched for this and only kept finding a fix for the 90-92 or the carb camaros only. I have the seperate coil so im not sure where the rpm wire is but i checked all the wires and they are all plugged in. Now here is the problem, on my 87 the needle goes all the way up and stays there and back down when off. And on the 89 the leedle goes to about 6500rpms and goes up a little tiny bit when revved, even when the turn signals are on too lol. What can be the problem? Or how can i solve it?
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
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The tach wire should be between the distributor and coil.
It might be labled TACH TERM.
Re your tach reading high your problem is in the circuit inside the dash that moves the pointer.
It’s contained on a small plug-in PCB.
On the PCB you’ll see a resistor chip.
Desolder pins 4 & 10.
Use a 500K potentiometer.
Solder it across traces 4 & 10.
Move the potentiometer to half way.
Start the engine and compare the tach reading with a test equipment quality tach.
Dial it in, unsolder one side of the potentiometer, measure it and buy the matching resistor.
Happy Racing!
If People Drove Any Slower They’d Be Going BackwardsHow bout those dorks too scared to drive without headlights in the daytime!
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1988, 89, backwards, camaro, gauge, guage, high, potentiometer, reading, rpm, tach, tachometer, tbi, tpi, tpithirdgen
