Bad instrument voltage regulator. All three of those malfunctioning gauges are powered from that regulator. It's on the back of the cluster. Hard to get to when the cluster is still in the car.
Real Time makes an electronic version of the regulator.
http://rt-eng.com/rte/index.php/Main_PageIn the meantime, might consider disconnecting sender leads from gas sender, oil pressure sender, and coolant temp sender so as not to fry your gauges - especially fuel and oil pressure, since they're pegged.
Sorry, reread your post. Perhaps you pinched a wire on the VR limiter reinstall, or inadvertently grounded the posts on the fuel and oil pressure gauge sending unit side?
