Hi, i've also got a fairlane, the self leveling suspension sucks, unless your towing anything heavy or constantly have large individuals in the back. Toss out those gas riser shocks and change all 4 corners to sensatracks. the car will be 100x better and no more saggy rear end. any other normal shock ive found dosent last the distance in the fairlane rear. You can turn off the self leveling suspension simply by pulling its circut breaker from the fuse box. The car wont even know its installed then.
As for the oil pressure, i can garrentee you its the oil pressure sender or theres crap on the contacts of it.
Ive had both problems with mine too!!!
PS. look forward to a new timing cover..