Fuel gauge. Again.

I have a 68 Dart GTS and both my temp and fuel gauges aren't working. I replaced the VR, and now when I turn the key, nothing happens (to engage the fuel gauge) but when I turn on the headlight switch the fuel gauge pegs to full and then some. Is the headlight circuit different then the ignition circuit as far as that goes? I have yet to replace those stamped "nuts" for ground on the circuit board (which I also replaced). Any ideas?