Hi, I just joined up here and this is my first post.
I retrofitted an early power tilt to my '65 Johnson 75 HP. I believe I have the parts catalog and it may contain some wiring info. I will look it up on Sunday.
The wiring is pretty dead simple I think. The panel switch has momentary up and momentary down with center detent. Probably one wire is 12V hot, and the other two are the switched legs for "UP" or "DOWN".