Is it true a tachometer can be specific for a V6 or V8? Is there a way to change the setting to make it work?
THEBEAST84
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Mar 30, 2025
- Join DateJan 2008
- LocationTallahassee, Fl
- Posts:189
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- Car84 z28 h.o./ 92 rs
- Engine305 h/o /3.1 v6
- Transmissionhybird turbo 350/t5 bog warner
- Axle/Gearsnon posi 3.73 / ls 3.42
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i know on my 84 z28 i was but on my 92 rs it is ! so yes and no !
just take you tach off and look for a switch that says v6 v8 on the back of the tach !
good luck !
just take you tach off and look for a switch that says v6 v8 on the back of the tach !
good luck !
Member
i would think theres no difference, like a tachometer just measures rpm. 5000 rpm is 5000 rpm, shouldnt matter if its a v6 or a v8
Supreme Member
No difference in the gage, only the marked redline will be 6000 RPM's for a V-6.
Junior Member
for aftermarket it depends. i had a sunpro tach (cheap$30) that i bought once and it had a switch in the back for 4, 6 or 8 cyl. for stock, i wouldn't think so. the v6 i think gets the signal from the icm and the v8 gets it from the distributor.
Senior Member
There is a difference. I can't explain why, but i tested mine and there was a couple hundred Rpm difference in between settings.
Besides, If you have a v8, get a v8 tach. Doesn't that just make sense?
Besides, If you have a v8, get a v8 tach. Doesn't that just make sense?
Supreme Member
Quote:
Yes.Originally Posted by Sandslot;
Is there a way to change the setting to make it work? A tach lets you know the RPM VIA counting pulses from the ignition system.
An 8 cylinder engine produces 4 pulses per revolution.
A 6 cylinder engine produces 3 pulses per revolution.
A 4 cylinder engine produces 2 pulses per revolution.
Your problem can be remedied in the circuit inside the dash that moves the pointer.
It’s contained on a small plug-in PCB or integrated in the main board.
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.
Quote:
Be it V6 or V8, the tach gets its’ signal from the distributor COIL PRIMARY.Originally Posted by sablemaniac;
the V6 i think gets the signal from the icm and the v8 gets it from the distributor. ◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
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