Tacho wiring 1982 Jhonson 70hp

Toxicballsax

Cadet
Joined
Aug 8, 2011
Messages
12
I the boat I purchased ,has all of the gauges disconnected,so naturally I want them working .
The question is the Tacho ,has 3 plugs on the rear +,- and P .I would of assumed the + and - are the the power feeds and "P" being the pulse.But when + and - are connected the tacho swing right around to max RPM . SO what plug is what on the back .
Also does the pulse wire come from the low voltage wire from coil 1?
Many thanks in advanced:)
 
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