Jr88

I just got my '83 Rx7 couple of weeks back. When i bought the car, the oil pressure guage was sporadic, the fuel gauge didnt work, and the water temp gauge didnt work at all. Then after awhile, they all started working normal. Now Im back to no go on the fuel and water gauge. The oil pressure gauge still seems to work abit. Any ideas out there about what my prob is? Im thinking the dash is gonna have to come out, to take a peek. Unfortunately, I got the car from a dealer, so I don't know the history, the previous owner's story...