Ok, all of a sudden An Isspro Tach like quit working, I have pwr to it from the plug. When I stomp on it it will go up to like 2500 then when I let off it goes down to Zero. So, put new Isspro tach on and the same thing. Sometimes it bounces around a bit but usally at 0. Adjusted the cps and no change. Anyone have any ideas. Bad wire someplace??

 

almost sounds like a short somewhere... or maybe a loose/bad connection, wish i could help more.

 

That sucks. I hate wiring. it seems like my pyro doesn't work right if it is rainy outside. I don't know what to think about your problem though. Is the sensor good?

 

what are the chances of burning up a thermo-coupler? I think mine is too far in the manifold and could be burnt up from the extreme heat. Maybe it just went bad???

 

Is the truck still charging while the tach reads 0?

 

As far as I know it is charging, I am trying to help my brother in law over the phone with it. He called me a little while ago and said when he turns his blinker on it goes up to 1k and flickers. Som that tells me there has to be a bare sopt on a the wire somewhere and its grounding out somehow. I hooked all the other guages upm boost and pyro like I do them all and they work good. It is tough not having the problem in front of me to work on!!

 

I am betting on a power or grounding problem at the tach.