[Sargin]

So im driving home, and i dont really remeber but im pretty sure my guages were working, then i looked down agian and my tach, volts, and gas gauges were jacked up, i was almost on E and it went to half tank, tach is at 0 and volts are at 0, temp and speedo work.

What happened?

this is on my stock 89 GT

[Julian Moore]

That happend to me once. If it is the same thing, the car kept running right? If so, I pulled my gauge pod and noticed that the plug was loose. I wiggled it and that was the culprit. Hope this helps.

[meangreen92]

Sounds like the instrument panel voltage regulator, what was the oil
pressure guage doing? I've seen this on both my 82 and my 84, and
it's been a problem with Mustangs since the sixties. I've usually gotten
it to go away by carefully tapping/banging the dash at strategic locations.
Check every ground you can find, starting with the battery ground.