I recently bought a OMC tachometer on ebay that I thought would work for my boat, however I am uncertain now. My motor is a 1974 Johnson 85hp. The new tach says 5 pulse on the front. There are several part numbers on the box that has been lined out. The number on the back of the tach is 174054 which I found on the box too, but has been lined out. Anyhow, I went ahead and conected it and it worked, however I am not sure if it is accurate. Will this hurt anything, like the rectifier? <br />I checked the back of the tach where you can change the pulse and it appears to not be adjustable. I can read the numbers and it looks like the circuit card is pointing towards the number 6, but I am unsure?<br />Any help would be appreciated. Thanks.
