1970s OMC tachometer

[Bredbo]

Have recently purchased an 1973 OMC tachometer to match the speedo in my boat. It only has one wire going out of the tachometer which is gray. Is this normal? I was planning to wire to a powershift2 control box and a 1973 50 hp electric start Johnson. Can this be done with only the gray wire? Thanks

 

[racerone]

The gray wire is the alternator pulse wire.-------You have to supply other wires / 12 volts / ground as per a wiring diagram.

 

[Fiberglass Masters]

Is it OMC brand or like Airguide or something like that? Has to have a ground too, gray is your sender wire.

 

[F_R]

There were various OMC tachs in the early '70's. For instance some were for magneto motors, some were alternator tachs, some for the old battery CD models, and some "Universal Tachs". Point being, we don't know exactly what you have.

 

[boobie]

Read post #1.

 

[F_R]

????

 

[boobie]

The poster stated what motor he had.

 

[F_R]

I was questioning what tach he has. All he said was 1973.

 

[GA_Boater]

He also said it matches his speedo. No word if it matches his motor.

 

[boobie]

Good points.

 

[GA_Boater]

Bredbo Any numbers, like part numbers on the back of the tach? A couple of pics might help.

 

[sam am I]

I'm lost already! It's a 73 gray Speedo with good points and we're not sure if its one gray wire matches a engine we don't have a picture of, right?


J/K'ing, it's Friday night and livin it up in the ole iBoats Board with a boring bunch of old dudes in here........geeeesh, life is good!! Think I'll go shovel more snow now!!

 

[Faztbullet]