Testing System Check Tac, Help

Black Max

Petty Officer 3rd Class
Joined
Jun 9, 2003
Messages
91
1) I'm trying to set my boat up correctly, but I believe my tac must be reading wrong. How do I check to make sure it is the Tac? Do I just check the gray wire from the rectifier for a 12volt reading, or do i need to check the resistance?
It reads normal most of the time, but jumps a 1000 or 2000rpms randomly.

2) I think the Max recommended RPM is 5400?
 
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