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View Full Version : OMC System Check tach on older motor?



UNCC Grad
02-14-2007, 03:15 PM
Can anyone tell me if you can use a system check tach on a non-system check motor? I've got a system check tach that is supposed to be for a Suzuki and compatible to any outboard(according to my local shop that I bought it from), that has a 6 pin hookup as well as three wires with male ends (yellow, black and gray). I tried to hook it up using an OMC 3 wire harness hooking purple->gray, black->black and blue->light terminal post on tach.

It works fine until 2K rpms and drops out to zero. I checked the rectifier and it's fine as is the stator. The battery is charging as the motor runs and rpms increase. The motor is a 1984 70hp Evinrude.