jj62

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

iTrader: (4)

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

gofastwclass

iTrader: (2)

...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

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

1976CamaroGuy

iTrader: (8)

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?