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Since the coil is in the distributor, simply hook the tach 'trigger' wire to the out put on the side of the distributor cap marked 'tach'.
green
The tach should connect to the distributor.
yes, check out autometer.com and they have info on what color wire to tap into. I assume you have a tach, so what you do in run the tach pick up wire to the distributer (where all the spark plugs are) and there is a couple of wires going in the distributor, one of those is the one you need to carefully tap into. It will vary based on year and model.
if you mean tach/tachometer you have find an aftermarket tach driver and plug it in where the original tach plugs in
if it is a hei ignition there is a place on the distributor cap that says tach.
there will be a spot on back of distributor cap it will say tach run wire from there to gauge. You probably need to run a switched 12v lead as well to illuminate the tach at night. The tach slot on the distributor will take care of 'timing' the pulse to the tach. Often times the tach will have a switch setting for 4-6-8 cylinder. Read the manufacturer instructions carefully.
On the dist., cap, where the wires go in, there is a tab labeled TACH.
Yes, a disconnected or broken TACH wire from the HEI distributor cap can cause a '79 trans to fail to start.
Yes you can no problem.
The one marked "tach"
You would hook to the negative side of the coil. Some HEI distributor caps are marked "tach".