TOPIC: Airguide Tach sending unit

Hey guys anyone have a lead on an airguide tach transmitter / sending unit ? I have a 61 75hp Johnson with magneto ignition and trying to hunt down the little black box.

Any input on the model 650 or 653 airguide tachometer wiring would be greatly appreciated!!

Thanks, Chase

Think there is something on that in the J.E.G.O. section within the past couple of months.

Thank you. I will see if I can find more in that section.

Still on the hunt for this part. Anyone have a link to one for sale? Or personal experience on wiring one of these up to a v4 Johnson with Magneto ignition?

I'll be following this...I would also like to know how/where exactly these get wired up...I know some of these gauges had the sending unit mounted on the back of the gauge so I'd suspect I could mount it under the helm out of the weather.

Finding the proper transmitter is difficult.


If anybody knows any thing bout lectricty maybe they make one up.

Terry

Thank you!!! This helps tremendously!!

As luck would have it I finally located an Airguide Magneto transmitter box!

Model 650 flush mount Tach with the transmitter box and has the matching yellow QC number on both gauge and box.

In need of the knowledge of how the older square studded transmitters are wired up.

Any help would be greatly appreciated!

The model 650 Tachometer came in along with its matching transmitter box.

If anyone is wondering how to wire up the older Model 650 square transmitter box on a Johnson/Evinrude V4 with Magneto Ignition I tested it out and have results.

M1 to Ground
M2 to Kill Switch/Mag Lead
+ to + on back of Tachometer
- to - on back of Tachometer

I disconnected the cog belt that drives the Mag and spun it with a drill for this test. I have yet to test it on the engine while it is running but when I do will update this.

I attached the ground lead to M1 after looking at a similar model 653 square box with the M1 labeled "GND" I believe this is the correct way to install it. I decide to switch M1 and M2 to test and the result showed it still showed rpm but the needle was very unstable. Switched back to M1 ground and M2 Mag lead and the rpm needle was very steady.

Hope this helps someone in the future!