Hey guys haven't been on years. I finally have a computer now . My 90 f250 has the overdrive light on the whole time I replaced the button still the same problem. The trans will manual shift fine but in drive it feels like its in third. The tach also doesn't work it stays at 0 all the time. Fuses are good. Could the tps be bad??

 

that a possibility but all my stuff has checked out fine and i dont know where to go for now on.

 

Alright hmmmm just got to ohm it now

 

need tach fixed.

 

I need to fix the tach before I ohm the tps

 

let me know what ends up workin for you because as of now im out of ideas and its still messing up

 

the tach not working will screw with the e4ohno computer.

 

well im not sure if your talking to me or him but my tach is working fine

 

check the pick up on the injection pump housing area, it has two wires comming out of it, my understanding is thats the tach pick up.... might be another one but mines an 87.
not sure if thier might be one near the crankshaft, like a crank position sensor.

 

nope. all IDI tachs are located on the timing gear cover.