[justinbmurphy]

i just installed a brand new teleflex tach for outboards on my 1982 mariner 70hp. i used all new wiring, heat shrink connectors and ring terminals, i have a good ground and all other gauges work properly, however, when i run the motor the tach will smoothly increase to 6000 rpm when the boat is half throttle, also it will go down when i increase the throttle and it is very erratic at other points. i have searched this forum and all i can find is to clean terminals, is it possible that i could have a frayed wire in the original harness? any ideas would be great, thanks everyone.

[Laddies]

If the tach reads 6000 at half throttle you need to reset the pulse setting on the back. Maybe this will help. http://www.downloadingfiles.co.uk/te...es/page342.pdf

[justinbmurphy]

yeah i tried that from 6 pole to 12 pole, still was acting crazy

[Laddies]

Sounds like a bad tach then.

[justinbmurphy]

yikes, well i live by ebay and die by ebay, anyway to test it or just go ahead and replace.

[Laddies]

Hook it to anouther engine with jumper wires and see what it does

[justinbmurphy]

thanks for all your help