Tach issue

bigbassc

New Member
Joined
Mar 12, 2010
Location
Richfield, MN
#1
Hey guyslend me your expertise. Are tachs calibrated to the RPM ove rev sensor on a Merc 175 EFI? Last weekend my tach read over 6000 rpms with no tone going off. I don't want to blow a powerhead but my gps speed shows I am not hauling a$$ either. Any hints on the problem?:confused: