More Electrical Help ...

Hello - I am back after some work and medical issues and trying to resolve the electrical problems that remain....I took all your advice and studied it during my "off" time. Now the temp gauge is OK and all the other accessories work. The last issues are the gas gauge and the instrument cluster lights. What if the gas gauge was not connected to the sending unit? Would it peg low? Checked the fuses for the lights and they are good...going to check the voltage at the fuse block next...thanks again for your insights.
Jason