89 Mercury tach?

ralphhotdog

Cadet
Joined
May 31, 2003
Messages
21
The Teleflex tach on my 89 Mercury 35 serial #0b393755 doesn't read anything until it gets to 1000 rpms. At the other end, when it reaches 4500 rpms it starts bouncing back and forth. Any ideas guys? On the back of the tack which switch position should it be set on? Right now it's set on P2.
 
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