1994 K1500 dash electrical oddities

1. When cold, turning the headlights on will result in immediate headlights, but a 10-20 second delay in the dash lights. At the same time, there will be a 10-20 second delay in taillights as well.

--Headlight switch was replaced. Same issue resulted.

1. Typical "sensitive" dash gauges. Any draw on power to the dash will result in the gauge needles jumping. When I turn on the turn signal, the volt meter jumps +/- 5 volts with every blink of the signal, and the speedo will jump a hair for the first blink or two of the turn signal.

--Truck has 2 new dual batteries and a good alternator.