Fuel pressure spec is 39psi +/- 2psi on your 95 5.2. And fuel pressure shouldn't drop below 24psi after 10-20 minutes after shut down or check valve may be bad or other leaks.
95 is the 1st year they moved the fuel pressure regulator into the fuel pump module in the tank. The telltale sign the regulator is not external is there will just be one fuel line connecting to the rail instead of a 2nd for a return line.
Many parts stores have loaner fuel pressure testers to connect to the rail. Just make sure you tell them it's a Chrysler/Jeep schroader valve connector which they normally are.
There's a good chance the whole pump is bad from sitting so long along with corrosion on the sending unit in the module too. This would cause the gas gauge not to work.
Don't go on the cheap when buying a new fuel pump module or you'll be sorry. Rockauto carries the Bosch 67637 for your 95 5.2 for $176. Bosch is OE and Mopar just repackages them while selling them for a whole lot more. Here's the description from Rockauto with photo and I couldn't find it at a lower price anywhere else.
Prior to installing a new pump you could just change the fuel filter to see if that helps. But it isn't going to get the gas gauge working. Believe I'd also check the wiring around the fuel tank going to the pump to make sure there isn't rodent wire damage from sitting so long.
You could also add some fuel additive to it like "Heet" to try and break down any water in the tank. Not a bad idea to check to make sure the horn work then flip the relay with the fuel pump relay in the PDC (fuse/relay box) in the engine compartment.
Actually if you replace the pump module it would be best to remove the whole tank and clean it out with soap along with warm water. But know this is hard to do in the winter months and you just filled it up. Regardless, you will have to get most of the fuel out of there to drop the tank since it's so heavy. Good luck!