Tach Doesn't Registar Correctly

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Dec 4, 2009 | 03:53 PM

jj62

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From: Redlands, Ca

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

Dec 4, 2009 | 05:54 PM

techrunner

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

Dec 4, 2009 | 06:06 PM

gofastwclass

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From: KCMO

...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.

Dec 5, 2009 | 11:35 AM