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Tachometer OMC connection

N

nantanger

New member
"hello, I'm french and I&#

"hello, I'm french and I'm looking for the way to connect a OMC tachometer I bought it in a little market.
There are 4 cables, one grey, one black, one blue and one purple. the label indicate "174048, for use on 2,3,4 pul/rev". I would like to use it on a vintage car, as beetle or bus vw. Is ther some body to help me ? thanks from France, stéphane"
 
"Ayuh,...

My Guess is,...

"Ayuh,...

My Guess is,...
You bought a Tach for a 2-stroke Outboard motor....

It Won't work on a 4-stroke VW motor....}"
 
"hello, thanks for your answer

"hello, thanks for your answer. so I will give it to a friend who use to go on the road with DKW, if you know ;o) a two stroke engine on a vintage german car. is it possible to have details on the connection cables (the 4 colors) ?"
 
"Wires:
Grey-pulse input
Bla

"Wires:
Grey-pulse input
Black-ground
Blue-dial lighting
Purple-Ignition switched B+

Most OMC tachs from recent history run from the charging system, and would deliver a pulse similar to that produced by a battery driven breaker ignition system. On the other hand, if it's set up for an outboard magneto, it might be designed for pulses of 200 volts or more. Either way, you're probably not going to blow it up by trying it on your four stroke."
 
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