Hey, not sure if youn ever figured it out but I bought a universal $20 oil pressure gauge at autozone and hooked it up. Turns out it didn't come with the proper fitting for our block but the fittings it did come with are brass and our block is steel, therefore if you screw it in jusst right you can squeeze it in there and just leave it because the brass is softer than steel. Also the tubing it came with was pretty short so I had to run it over the top of the block (making sure not to touch any exhaust) and by the oil cap and through the passenger side firewall right under the glove compartment. Btw the only way to get ahold of the oil pressure sending unit is to take out either the oil filter or the alternator.. It is a major pain.. As for having good pressure I don't have my Haynes manual on me but mine runs about 20-30psi at idle and 50-70 and even up to 80 at times on the move. Which From my understanding is pretty good..
Let me know what works and if I helped.