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Jan 31, 2011 | 09:13 AM

walkthelin3

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Joined: Apr 2010

Posts: 252

Likes: 0

From: tuckerton nj

Car: 1987 camaro,88 firebird

Engine: 2.8 v6,5.0 tpi

Transmission: manual

Axle/Gears: 3.47

rpm

i just upgraded my 6 cyl to the z 145 cluster.. idk if my idle is right because i fiddled with it in order to try n get it running.. and on top of that idk if my rpm gauge is off..is there any way to calibrate it? and also is there a way to find out the engine rpm without an rpm gauge or a fancy computer tool?

Jan 31, 2011 | 10:08 AM

NINÅ

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

Can I Magically Calibrate The Tach With No Test Equipment?

There is circuitry in the dash near the tach.

It’s contained on a small plug-in PCB or integrated in the main board.

On or near the PCB you’ll see a capacitor, replace it.

Also 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 the potentiometer, measure it and install a matching resistor.

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Happy Racing!
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How bout those too scared to drive without headlights in the daytimeand the ones that need headlights for a little rain

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