Alright, so here's the deal. My tach gets power, the fuse is fine, checked that, but with the key to the accessory position, it goes to 3300-3400rpm right away before even starting the truck. After starting the truck, it seems like when I get the truck to what feels like that rpm, the tach starts going up. Any ideas what this could be?

 

tach is broke...or there is a bad ground and it is back feeding...

 

Tach broke. Mine was havin problems, got one from ebay, works great now.

 

Is there any way to fix it? Or should I just grab one from a junk yard?

 

Wish mine had a tach...

 

me too....

 

I'm lost without a tach. This is the first thing I've ever driven that didn't have a working tach. I don't like the feeling, it's like not knowing whats going on.