I have been working on my 1970 Mustang with my Dad. He has addressed to me that the lights that are supposed to light up the individual gauges to see them at night do not work. The headlight switch has been replaced recently so I don't think that it is the culprit. Automotive wiring, electricity, etc is not my specialty or strong point, but I sort of know that there are switches, fuses, resistors, and other stuff involved. Could the bulbs just be bad? I also got a suggestion from a friend that a circuit could have burned out since the cluster lights were ran on a printed circuit for 1970. So could this also mean that there is a possibility that the courtesy light circuit is bad? If so, can it be replaced by someone who has had little experience with electrical work?