ok here's the story. I have a gsr si hatch the starter started gone bad on me, (sticking and shi*) I didn't put to much mind to it cus I don't drive it much. but I when to crank it up one day and something in the starter must of grounded out when I turned the key and the negative terminal got so hot it melted the stump of the negative terminal and the battery ground that is connected to the transmission melted right off. I went and got a brand new starter and new negative battery terminal cable, installed it and the car turns on just fine and drives normal. here's where the problems lays, at night when I turn on my headlights I lose vtec and my gauge cluster starts tripping out , I turn my headlights off everything returns to normal, I look around to see if any other wires my of gotten melted in the process but everything looks fine to the naked eye...what could be causing this..I've asked had people look at it and nothing im at the point where I want to swap the entire harness but really don't want to go thru all that work, can some one plz help me out going crazy trying to figure this out..

 

i would start byu checking the thermostat ground, and the transmission and engine to body grounds and make sure they are all good wiring with clean contacts.

 

Ditto the above^^^ when one circuit, in your case, [head lights, constant power circuit] has an effect on an unrelated circuit, [cluster, switched circuit] it is almost always a grounding issue, the one thing that is common to all circuits is the grounds.
Because both the head lights and cluster are grounded to the chassis, I would pay close attention the batt. to chassis ground, DO NOT just eyeball it, disconnect/clean/reconnect. 94