I have a 1989 gmc 1500 it loses total power when drivng like a stutter just for a few seconds have to reset radio all the time changed altenator and battery and cleaned all ground wires.

SOURCE: 2003 New Beetle battery fuse panel melting

you have short somewhere

SOURCE: 1987 ford Bronco II fuel gage doesn't work-reads empty all time

I need to know if the other gauges are accurate. There is a voltage regulator mounted on the back side of the dash that can go bad and often does, that will make the other gauges inaccurate also.

SOURCE: 1989 GMC 2500 5.7L - engine surges and stalls at idle. Loses power at cruising speed.

Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.

SOURCE: Battery light still on after changing alternator and battery.

Did you check the fuses? Are your cables to the battery corroded? Is your ground wire connection clean . Did you get a cheap-*** alternator? Did they check it where you bought it? You may have to have it checked at a napa or other store. Sometimes "reconditioned" means "repainted"
Hey, I've been there. If its a discount store alternator get another place to check it. May save you some grief.

SOURCE: My Power window on my 2003 GMC Sierra 1500 Truck

if your main switch panel still works the passenger window and if door locks still work probaly bad window motor