At start my oil pressure gauge reads 40 psi, then slowly drops to 3-4 psi after about 1 hour of running during the winter months. After that it seems to continue dropping and the temp. gauge hits 180+ and up, so I pull back on the throttle ( Things get worse in the summer). To add to the fun it blows lots of smoke into the cabin, despite the addition of an Indigo pcv unit. The engine is rebuilt with fresh water cooling. Any suggestions?