Hello Rhett,
Pop would be proud of the love your giving the truck... I put a locking gas cap with the three raised ridges so the fuel cap door closes all the way... A locking cap can easily be defeated but not without putting a screw into it... At least you will know if something was put into the tank other than gas (non ethanol is good gas)...

I am in the process of trying to rebuild a Mikuni carb; checkout my photo album for pics of the 1st carb rebuild I completed... Can't help the light issue but CAR-PART.COM connects with wrecking yards nation wide...

Photos Please & Good Luck