head lights pulse after bypassing my bulkhead

I have to hand it to you for your persistence! That has to be about the strangest thing I have heard of. The gauge lights should be so miniscule in power draw compared to the lights themselves that it seems illogical for them to effect the regulation..... Wiring them to the headlight output would be the logical thing to do. Are these LED or older incandescent bulbs?

How are these gauges grounded? How hard would it be to disconnect the headlights and connect these gauge lights to see what happens?