Hey folks, this is a weird one...Have a customer truck that works perfectly, but the tach is reading 50% of what it should be. I searched here and didnt see anything, and I havent had time to electrically troubleshoot it yet, so I figured I would post here and see if anyone else had ever seen this. Let me know, thanks!

 

There are two recesses on the damper for the speed sensor to pick up, maybe one of them has some dirt in them so it only sees one?