Ok Guys I Need Some Electrical Help On 67 Chevy

[seatacwhat]

ok i can pretty much say i have a something bad going on because when i turn my headlight switch to turn just my markers on i get both tail and both front grill markers on. so when i turn headlight switch all way on i lose my front grill marker lights and get no headlights at all. i think i may have figured out the headlight issue the bulbs are burned out. but i still lose my markers in the grill.

thats just the beginning. my driver side brake light will not work and its not bulb also my driver rear turn signal will not work. when i check for power on the light socket i only get one element getting power too it. the other does not and that is when i had both turn signal and brake pedal compressed. also when i turn my turn signal switch both right and left my gauges go kookoo. my fuel gauge will drops to empty and my oil pressure gauge starts going haywire as will as my battery gauge starts doing crazy twitches.

any help would be great. ive check for bad grounds and crossed wires just cant find problem. just thought maybe someone else has had same problem and knows solution thanks