Re: Installing Tach on older motor
Just follow the directions included with the tach - it's not too hard. I picked up a Teleflex tach on eBay for $40 including shipping.<br /><br />I just jury-rigged the tach on my '75 70HP on my vacation. The terminal strip on the EV is imprinted with what color wires go where. It should be the same as mine, which is the 3rd screw from the top, which is bridged with the 4th screw. That is your sender. I took a piece of power cord from a vacuum cleaner (did I say jury rigged?), used one lead for the signal, and the other for ground (direct to the engine), & ran it forward and connected to the appropriate terminals on the tach. I then took another piece of wire and a cigarette ligher plug & used that to get power to the tach by hooking it up to the IGN terminal. You must remember to disconnect from the receptacle after shutting down or you will drain the battery. <br /><br />This worked like a charm. I did this to do some prop diagnostics by swapping props. I will eventually do a proper installation - I just didn't want to get involved in pulling apart my engine controller to get into the ignition switch! <br /><br />I'll do the proper install with properly run wiring over the winter.<br /><br />Never dealt with Force engines, but it can't be that different - pick up a good engine repair manual with electrical diagrams & you should be fine!
