Ok I bought a Tach.. and I'm going to put it on... I got the tank off. I had to take the petthingy completly off.. maybe next time I will use more force to try to yank the tank off without taking the petthing off.. Ok.. I have seen to different explanation of wiring..
1.RED wire Connect to 12 Volt source powered when ignition is on
BLUE Wire to lamp on, (12 volt DC source to power the light inside the tach).
BLACK Wire Connect to FRAME Ground).
GREEN WIRE Connect to negative terminal of coil
2.on the Barrons tach you have 4 wires - green for the trigger wire - this connects to the top connector of the coil, a red and a blue wire - one is for the tach light(blue one I think) and the other the one is for + battery connection (red i think) connect both of these to the bottom connector of the coil which is the hot wire, the other wire is black and this goes to ground - I just connected this to one of the bolts that holds the coil to the frame.
On mine there is no blue wire (see pic) but to black ones.
Can anyone give me a hint.. so I don't mess this up...