'65 Formula S Tachometer Help?

I found a magnifying glass and was able to read the installed (burned out, of course) bulb on the socket of an orange wire: #57. I will assume that is what the factory specified. It looks like wire colors for the tach gauge hook up are yellow (hard to say) (with a female/rubber push on connector) and black (with a round circular brass terminal). Still need to find out which wire goes where.