Force Mercury Universal Tach hook-up

wellsc1 · #1 May 2nd, 2009, 08:55 AM

I recently purchased a universal tach without a manual and brand uknown (desparate for a cheap tach). The three connections on the back are labled, "+", "-" and "P". However, I find the wires from the motor "IGN", "SEND", and "GRD". How do the wires cross-connect to the labled three connections? It's a new 12-pole tach I hope works.

tnx for helping watch my motor rev. carl

CharlieB · #2 May 2nd, 2009, 10:56 AM

+ red switched on by the ignition
- black battery ground
p grey from the rectifier on the motor

wellsc1 · #3 May 5th, 2009, 08:15 AM

Thank you for the hook-up. To re-iterate:

+ equals ign.
- equals grd.
P equals send (rectifier)

Thanks again. Looking forward to seeing RPMs.

wellsc1 · #4 May 6th, 2009, 10:24 PM

The hook-up worked perfectly and saw engine idle around 1100 rpms. Short rev up showed increase on dial. Can't wait to get it on the water now.

Great Lakes Skipper got a great review from me on ebay.

Too many toys, too little time.