Tachometer

[gregtobin]

My '79 Glassmaster with '74 Merc 1150 motor has a tachometer in the instrument panel. The wiring behind the panel is an amazing mess. The only things that work are the light and bilge switches. Although is it hard to trace all the wires, because it seems that someone replaced the harness and left most of the trash behind, it appears that the hot wire comes into a small junction box that feeds the working switches.

I'd like to hook up the tach. Should I remove it from the panel and hook it up to my car to make sure it works or should I assume that it will work if I connect it to the outboard? How does it connect to the mercury 1150.

 

[ricksrster]

Re: Tachometer

This is how it connects to your motor:
It may be plugged into the little harness or plug on your Shift/throttle control. Or it may be spliced in. If not, on the back of the tach you will find a post for ign. This wire connects to 12v+ from the ignition key in the on position. There will be a post for Light. This connects to your lights or light switch. Ground goes to - ground of course and the Send wire goes to either yellow wire at your rectifier on your motor. The little switch on the back of the tach should be set at 6P. Here is a link to help you.
http://ww2.tflx.com/PDF/99320.pdf I wouldn't try to hook it up to your car.