Ford: tach on a 1992 diesel ford super duty truck, ford super duty, tachs

Question
the tach doesn't work all the time?  Just wondering if anyone knows anything special about diesel tach's.
Thanks

Answer
Gretchen,

If it is bouncing around, I recommend that you check the ground as you may have a short. To my knowledge, the tachs are all hooked up the same regardless if it is a diesel or gas vehicle. Hope that his helps and if you need further assistance, please do not hesitate to contact me. Good luck.


Ken