Tach doesn't move when engine cold

[veniz23]

I haven't seen any posts for this problem, well I don't know that it is a problem. Its just a little weird and I was wondering if this is common or if there is a solution to this. The tach doesn't move much at all when the motor is cold, but when it is warmed up it moves fine.

 

[Justshootme84]

WOW, that's an unusual problem!!! I know that the moment I start my truck the tach shows the rpm's. It takes a little while for the choke to kick in and the idle to drop, so that's how I know it's working. Might check for a loose wire/connection, and post up the year model, engine, etc. of your Bronco. We have some great tech guys here that can answer your question.

 

[veniz23]

It's an '82 bronco Full Size XLT Lariat with a 302w. I have had this problem for as long as I can remember. All of the connections are tight.