[HaMm3r]

Hey Matty, yeah that was me in the link you referenced.

In my case, I didn't have a built-in tach connection on my control box, so I had to figure out another way. 6 months later and the MSD pickup is still working great, btw.

If you have a tach harness on yours, you may just be able to plug in and go. Check the specs on your control box and see if it includes a tach signal output.

 

[Dillusion]

Hey Matty, yeah that was me in the link you referenced. 

In my case, I didn't have a built-in tach connection on my control box, so I had to figure out another way. 6 months later and the MSD pickup is still working great, btw. 

If you have a tach harness on yours, you may just be able to plug in and go. Check the specs on your control box and see if it includes a tach signal output.

My merc does have a "tach module harness" but I have no idea how to hook up to it.

Ay ideas? Wll it be easier? Not necessarily easier as your fix was easier but...more native?

 

[HaMm3r]

I haven't tried to look it up, but I'm sure the wiring diagram for the harness is available somewhere on the web. The tach itself really only requires one wire from the engine, which carries the tach signal. It's usually gray on Mercs. The tach will also need a positive power and ground connection, but that doesn't necessarily have to come from the engine/harness.

I might be wrong about this, but I think the wiring harness is mostly designed to to connect to the wiring harness from a remote control box, and the tach plugs into that. Since yours is tiller, it might be easier to wire the tach in direct and not worry about the other connections in the harness.