New from Pittsburgh with questions.

Hey guys, I just picked up a heavily used 6x4 for the fire department I'm a part of right outside of Pittsburgh PA. I got the gator for $2,000 and a list of things that need done to it. It has 1500 hours on it, and tons of rust. I plan on fabbing a new dump bed up, and cleaning up all the rust on the frame and repainting it. It feels like it runs solid, but does leak oil. The previous owner said it was from the oil pressure switch needing replaced. He supplied me with a new one (part #M152192) so I guess I'll need to get around to doing that. If anyone has done it, any tips or pointers would be greatly appreciated. The serial number is: W006X4X019964 if anyone knows what year this could be that'd be awesome. I tried looking it up, but it seems I'm looking in all the wrong places. I'm excited to learn about this platform and hopefully meet some knowledgeable people. I'm hoping I can get this thing in great shape so I don't get hosed for buying a "lemon".
Thanks in advance!
Roy
Pittsburgh, Pa.