Iv got a 2001 efi ser number ot467866 just had the water pump changed by a merc dealer due to an alarm going off at idle,after taking the boat out again now with a smart craft guage this is what i observed ,still creeping up at idle until it hits 185 and alarm goes off,idle it up and temp goes down alarm cuts off,if i idle it at 1200rpm it stays around 135-140 aprox 9 or 10 psi on the guage.at idle the gauge reads from 9-7 psi it jumps up and down.on a plane and pushing it psi around 12 i believe and temp is from say 125-135 degrees runs great idling and pushing it.what iv done new wp kit done by merc dealer,thermostats and gaskets oem(last year) rebuilt poppet valve,new upper temperature sensors oem,new plugs and wires.I ordered everything to rebuild the pump again which includes the housings top and bottom,i am just bewildered how two pumps with very low or in one case maybe three hrs use cant keep the thing cool at idle.motors got 185 hrs