So I picked up a 1970 Duster today, got some newb questions

I guess another question I should have asked is what service manual should I get and where should I get it from?

How do I get to the sending unit? Do I go through the hole for the filler tube in the trunk? Once I get there, what am I looking for?

How do I get to the instrument panel bulbs to replace them (which screws need to be taken out)?

I will check the headlight switch, had an issue with that in my coronet, switch shorted out and the lowbeams wouldn't work.


Where is the circuit board with the voltage regulator? If the voltage regulator is built into the gas gauge, how do I check it and how do I replace it? Would I need a whole new gauge?

Sorry but all my experience is in working on bikes, not cars, and I've never had to troubleshoot an electrical problem.