I topped off my gas tank in my 94 Ranger STX 3.0L a couple of days ago and noticed that when full, the gauge reads WAY above full, much more than normal. Same thing for my ammeter and oil pressure and temp gauges. I also have an 85 Mustang SVO, and from my experiences with it, the instrument cluster voltage regulator was usually the fault. I know that things have changed a bit between my 85 SVO and my 94 Ranger, but I need to know if anyone has had this issue before and what the fix is? I have check and clean all of the obvious grounds between the engine and body, verified and cleaned my grounds at the negative terminal on the battery. Am I missing anything? Can anyone help me out with this?

Thanks all in advance.