I did a search and could not find what I was looking for. I hope I have this in the right forum. I have a 1977 Johnson 140 that the Teleflex tachometer will not read past 4200 rpm. I cannot remember if this ever did read right since I installed it- kinda fuzzy there. Long story short- no running problems, the adjustment for the poles is set correctly on the back, but I found out the long way that it is reading incorrectly as I finally piggied back the OE tach and it will read past the 4200. Both seem to be close to readings up to that point, but the Teleflex just stops at 4200. The thing that is really different between the two is that the OE tach does not require a positive switched wire input as the Teleflex does. The alternator is charging but I am concerned that since it is unregulated that it may be causing the issue hence the main reason I have not ran out and grabbed a new tach to throw at it. The Teleflex will go to zero when the ignition is turned on. Anyone else here have this issue ?
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