I've had the tach needle die (fall to 0) then jump right back to its proper rpm while driving. It didn't affect the engine, it was like it lost a signal and then re-established.

This first happened after I installed the interceptor, I don't think that is the issue as I un installed it so I can get the car inspected. I never got a CEL with the interceptor installed when this happened.

It happened again tonight right after I took the interceptor out, the car threw a trouble code this time, it was a U0121 which was a ABS trouble code...why would the ABS have anything to do with the Tach?

Could I have pinched a wire? Any idea? It did seem to happen over rough roads only.

 

I cant say ive ever had this happen. It does kinda sound like maybe you pinched a wire since it seems to happen only of rough roads.

 

i use to have this happen in my other car where the tach needle would drop to zero when i pres the clutch in then wehn i let the clutch out it regains power but that was b/c my battery wires where not tight all the way so i just tighten my battery wires and it worked fine after that..not even sure if that helps but i gave it a shot

 

brillo,

that is way way out there.... i would check to see if something hit an abs sensor...... make sure the connections are secure...

beers