z28 rs w 4 sp muncie trans,
 

I just bought a 1973 chevy camaro z28 rally sport matching numbers, restored about 4 years ago, excellent condition. it has a 4 speed muncie transmission. my backup lights dont work and someone said there is a switch on the transmission that turns on the backup lights when you put it in gear. i ordered and received the switch but cant find any diagrams of where it is... does anyone know where i could find this out or does anyone out there know? thanks for any help.

also fuel gauge goes all the way to full and then goes back down. wondering what that might be... i'm not a mechanic , just an owner and driver.