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Post a pic of the tach like TNriverjet said so we can understand what's going on.

mogger7 this might help. It's a little confusing because in the first picture he has a red wire on the bus bar and then it's suddenly brown where it connects to the dash https://www.steelsoldiers.com/showthread.php?153495-hmmwv-tachometer-installation&highlight=Tachometer

What did you use to make the hole? Keyhole drill? I think that's the best looking spot for it Ive seen.