So I'm finally done with the guage install. I left my stock non-rallye guages in place, but added oil pressure, volts, and water temp. Also did a bunch of wiring fixes (thanks whoever had this car before me...you really know how to make a mess!). Everything looks good (no pics yet, take my word for it), but there is a small mystery.
As I'm tucking wires up into the space above where the radio will eventually reside, I find a green wire and a black wire. Both cut/taped off. They disappear towards the passenger side of the dash. I'm curious what these could be. Any guesses?