So i have a 88 GT and i have a cluster wiring issue. When i turn on the brights my temp gauge jumps up, my battery gauge goes down, my RMP gauge goes up and also the speedo. Also all of the lights shut off on the cluster. When i turn on the left blinker the arrow shows up but when i turn on the right the needle for RPM and the right side of the RPM gauge blink and there is no arrow. I've tried different MultiFunction switches but the current one the wipers dont work, another one the headlights didnt work, and the other one the brights stayed on. So i bought a brand new one and im waiting for it to come in. I've taken apart the cluster housing around the cluster to check for bad wires but nothing. I've taken apart the cluster as well and i didnt notice any bad connections inside. The plastic little backing that has all the copper connections had a few bent parts on it and i slightly fixed it but nothing happened. My low oil light is always on and i messed with the wiring a bit and i had no coolant and the light for that came on and the oil light went off and now the oil light is back on and no low coolant light. IDK if it matters but i have a 140MPH cluster and i think the 88 came with the 85MPH ones but correct me if im wrong. The low oil comes on on the cluster not on the little light housing right of the steering column. Im completely lost. Im looking into buying a 88 original 85MPh cluster to hope it fixes the problem but id like some input on it. I KNOW THERE IS ANOTHER THREAD SIMILAR TO THIS ONE BUT THERE WAS NO FIX!! I do think thats all the info. Oh also when i hooked up a LED bulb to the passenger headlight the cluster thing would go crazy without turning the brights on.