Although we were able to get the tachometer working previously, we decided to remove it from the dash to clean it and check/clean the electrical connections.
We made sure to take several pictures of the back side of the tach before pulling it to ensure we could get the wires back on correctly. Immediately upon removing the tach, we used the pictures to label the back side of the tach with a Sharpie for each of the wire colors. There were 7 connections:
1. White male
2. White female
3. 2 wire green
4. 2 wire green/red stripe and black
5. Red/white stripe (light)
7, Yellow/green stripe [check out Project #17 for an explanation of this wire]
We were pretty confused right off the bat on the number of wires. I haven't found an explanation for why there are so many wires yet, but will at some point. Suffice it to say that we put them all back when we were done.
It was obvious upon removal that this was not the original tachometer. Apparently, sometime after 1971, a Midget became the donor of the current tachometer. I can't speak to the demise of either the 1971 Midget or the original tach, but I can say that we fully appreciate the tach working properly and looking really good.
Once removed from the dash we disassembled the face. There are several parts to the face: glass, bezel, inner ring (black) and gasket (prevents rattling)). After a light cleaning of the bezel with tooth paste and a cloth, it all went back together and back in the dash. After carefully putting all 7 connections back on, we started the engine and watched it immediately come back to life. Mission accomplished.