OMC Tach with a 76 Johnson

[ddrieck]

This is a mixed one and not sure which area to put this question but here goes.

I'm installing a 1976 Johnson 85hp V4 on my Starcraft this weekend and was wondering if I can still use the original OMC tach that was connected to the old Merc I removed? If so, does anyone have a wiring diagram to do this?

The OMC tach has several pulse settings.

Thanks,
Darren

 

[ezeke]

Re: OMC Tach with a 76 Johnson

What kind of control do you have? If it is a OMC J/E side mount, the wiring for the tach will be inside the control housing with a gray wire taped off.

If the Control is a newer side-mount, the tach wiring is in a three wire plug located on the control below the ignition switch.

The setting will need to be "6p".

 

[ddrieck]

Re: OMC Tach with a 76 Johnson

The controls are the old Johnson Command Center.

 

[ezeke]

Re: OMC Tach with a 76 Johnson

OK, you need a positive (purple) feed off the ignition switch "A".

You need a negative (black small "M") off the ignition switch.

Untape and connect the grey wire, which is the sender.

If you want lighting, run a blue wire from one of the other gauges.

Click the thumbnail, please.

 

[ddrieck]

Re: OMC Tach with a 76 Johnson

Thank You so much for the help!! This should work out great.....as long as it doesn't snow again. I've been trying to get this old Johnson hung for 4 weeks. Every time I think there is a break in the weather, wammo, mother nature throws a curve ball.

Thank Again,
Darren