gauge problems PLEASE HELP

[slammed_82]

my 82 is acting funny the fuel gauge bounces when driving and now when i turn the headlights on it goes half past empty and dont move it does not bounce there it acts like it is grounding but checked all the wiring and all is good and there is no gauge lights when i hit the high beams the head light go out all together but the blue light in the dash is on and it is also on when just the top lights are on when i shut the head lights off the gauge goes back up but still bounces i seen my high beam harness to the floor got hot at some point and melted so i am going to change the harness and put a new swicth in but there got to be more problems then just that right any help would be great thanks