I installed a new Teleflex Vector tach on my 1974 Johnson 85hp. At idle it registers 950 revs and at cruise speed 4000 which I believe is accurate, but after 4400 the tach begins to fall eventhough the engine rpm's go up.<br />I tested the voltage at the battery and get 13.5 vdc at idle so the...
My understanding is that 3 wires are needed to connect a tach: ground, ignition, and send.<br />My Medallion gauge has a post marked "GND"(ground) and a post marked "S"(send) but no connection for the ignition wire. I have tried it without the ignition wire connected but it does not work. Could...
I have an 1974 Johnson 85 hp that I would like to connect to the original tach in my boat. I have located the gray (send),purple (ign hot)and black (ground)wires, no problem.<br />Now my problem: the tach only has 2 connections, they are the same post used to mount the gauge, 1 post is marked...
