Handcannon the place the pen is pointing to is where the gauges plug in from the front side of the cluster the only lighting for the cluster are the 6 bulbs. Don't know if that is the same on a 94 but on the 95 and up they are marked ILL on the circuit ribbon. Most back lighting for the cluster (the bigger twist out sockets) are twist out and use 194 bulbs. I installed the new gauge cluster and it was definitely the fuel gauge. All the gauges can be removed and replaced. If your gauge does the spin around exocist move on you and you have checked everything start looking at the gauge. There seems to be some type of arm that stablizes the gauge to keep it from rocking back and forth that gets broken or messed up when the gauge goes crazy. I am glad I replaced the FSU because I didn't know how bad the tank was till I seen it, but I threw away a perfectly good FSU! Thanks for all your help!!