tach wiring harness. where to connect?

[Gregsmx]

I am upgrading my instrument cluster with a tach. The tach wiring harness has 3 cables:

Brown, which is a long cable and has a rubber firewall grommet on it indicating it goes into the engine compartment somewhere.

Reddish pink, which looks like it stays under dash.

Black. This is a ground wire.

Can someone tell me where to connect these 2 cables?

To make things more interesting, I am also installing a Painless wiring kit. Included with the under dash wire cluster is a pink wire labeled "Tachometer". So the question is which wire does it connect to, and where does the other go?

Thank you, Greg.

[ElGracho]

For the original harness, the pink wire plugs into the fuse box to an open "IGN" terminal and the brown wire hooks to the tach connection (marked "TACH") on your distributor cap.

[apstguy]

It seems like it would be tough, but once you find the terminal markerd TACH on the distributor cap, you'll wonder why it was so easy.

Shouldn't there be a 4th wire for the gauge light?

[N2TRUX]

This is funny! I just walked back in from doing the same thing on my 77. No, you don't need an extra lead for the lights. They are controlled by the dash lights...

[Gregsmx]

These boards are fantastic. Thank you all for the information. Sometimes what seems so difficult can be fairly easy. And the project doesn't have to be scrapped afterall!