LS1TECH - Camaro and Firebird Forum Discussion - Tach Doesn't Registar Correctly

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jj62	Dec 4, 2009 03:53 PM

Tach Doesn't Registar Correctly

Hooked up my tach from pin #10 to the stock
tach in my 85 ElKO SS, and it only reads 1000rpm at about 70mph.

I heard that there was something called doubler that
you have to install.

Has anyone had this problem and how did you solve it?

Thanks,
Joe

techrunner

Dec 4, 2009 05:54 PM

tuner can fix it in the ecm, or if you are running aftermarket tach just switch to 4 cyl mode

gofastwclass

Dec 4, 2009 06:06 PM

...or you can use a Dakota Digital SGI-8 if you are trying to run factory gauges and can't / don't want to mess with the tune. They also make an SGI-5 for the speedometer.

jj62	Dec 5, 2009 11:35 AM

Quote:

Originally Posted by gofastwclass (Post 12580616)

...or you can use a Dakota Digital SGI-8 if you are trying to run factory gauges and can't / don't want to mess with the tune. They also make an SGI-5 for the speedometer.

Thanks, I'll look into the Dakota SGI-8.

1976CamaroGuy

Dec 13, 2009 02:42 PM

Quote:

Originally Posted by techrunner (Post 12580548)

tuner can fix it in the ecm, or if you are running aftermarket tach just switch to 4 cyl mode

So if I'm running a factory V8 tach in an older car I need to let the person doing my reprogramming know so they can fix it to read correctly?

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