Alkijustin

Picked up a 98 Tahoe with a 5.3 and turbo. Don’t know anything about it except none of the gauges work. It was a 4x4 but most of that has been removed so it’s currently 2wd. I’d like to get the fuel gauge working at least. Any suggestions? It has a Holley computer system installed in the glove box currently but I’m unsure of what all has been done to the truck. Also how can I tell what motor is in it? Look for some of or numbers I’m sure but don’t know where to begin.