OK, so my tach hookup is one of my final tasks. The above link does not deal with it in any detail.
Basically, there is the power wire from the ignition switch en route to the coil which loops around some kind of signal receiver on the back of the tach. It was wound counter clockwise around the receiver. I have taken it off and wound it clockwise.
Second, there is a terminal on the back of the tach, I assume for power in. Wire diagram shows a white wire from the fuse box to the tach, so I assume this is a power lead. What do I do with this one? Just power it like before?
How is the tach grounded? Was there a ground wire under one of the small screws that hold the guts inside the casing?
Do I have to reverse the power flow to the tach (not the coil circuit) by powering the casing and grounding the terminal on the back of the tach? Sounds dangerous...
Sorry, I'm on the road and can't post pics.