Electric Bugs - Please Point me in the right direction

[83burban]

I went to install my new tach cluster into my 83 yesterday and ran into some problems with the electrical bugs.

1) I installed a new headlight switch since my old one was causing the dash lights to flicker constantly. Now when I pull it it 1 notch out - for just park lights - it will turn on the headlights as well. Pushing the high-beam floor switch will only activate the let high-beam bulb (they are both working).

2) The new cluster came with a 100 psi oil pressure gauge - the old one was a 60 psi. Do I need a 100 psi sender as well (when the engine runs the gauge will act like its still a 60 psi unit (pegs to 100 and then drops to 50 when warm - the old one pegged to 60 and dropped to 30 when warm).

3) When I pull the headlight switch all the way out, both the small fuel gauge and the oil pressure gauge suddenly stop receiving signals (they both act like they aren't working but when I turn off the headlight switch they return to normal)

What I am thinking is that since the old cluster had indicator lights for seat-belt, choke, and parking brake and I didn't remove the those pins from the connector the signals are going to the gauges? I matched all the gauges to the appropriate connectors and since it was a later 80's cluster it should be plug and play I thought.

Any direction guys? I will re-do the pins to make sure that isn't affecting anything but I am not sure about why the new headlight switch cause the gauges to stop working when pulled out or why my hazards and turn signals suddenly blew when I turned on the headlights.