The tack wire from the Crane box is green. Which wire on the Merc wiring harness does it go to?? Can't go to the coil, running the Crane coil.

The brown wire on most merc set ups put in with the neg input to the box I have a set of these I will have on on the next couple of days email [email protected] I have Thunder bolt 4 has any body used them and how do they work I think I will need the rev limter bad!!!!!

Waterfoul - I'm 99% sure the grey wire is your tach. I've done two and they work great.

it's gray on my boat. both the merc and the MSD tach wires were gray

Grey wire on mine also.

I think the Merc book calls it a tan wire but it looks a lot like grey to me. TACH??? We don' need no stinking TACH!!!!

Mike,
Just put one in myself, it is the gray wire. Relocated the original Merc amp and kept the old rotor. Just switch a couple of wires around and pop the cap and presto, spare ignition system. Be sure to ground the Crane coil well. If you don't your tach will freak out. If you still have tach problems install a 0 to 10k ohm pot in line with the tach signal wire and trim until tach works.

Have fun drilling the rotor! You should not have to change the timing, just put the drilled rotor in and your timing will be spot on.
Tim T.

I have mine hooked up and running the book says a tan but it sure looks gray to me the tach wont work with the crane hy6 and crane 92 coil in place I tryed puitting it in with the neg input and the green tach output on the crane unit where do I need to try a resistor?