gauge cluster

I have a 95 bird with the 4.6 v8, with a few mods... Well the problem is with my gauge cluster... first of all my oil pressure gauge does not work, and i have replaced the sender unit twice now. once and a while itll read pressure butmost of the time it doesnt moove. i know i have oil pressure or the motor would be tied up. That and the mileage gauge does not work. Ive herd froma few people that there is a little itt chip that sometimes comes disconnected and will cause that problem, but they said that most of the time that will make the gas gauge not work, oh and because the oil pressure gauge does not work, the little red light that says check gauges stays on and it anoys the piss out of me. any body have any suggestions ?