d16z6 t3/t4 turbo with 8 psi, i just installed an aftermarket oil pressure gauge, when i first start my car when it is cold, my oil pressure goes up to like 75 psi, after about 5 -10 minutes of driving my car the oil pressure drops to zero at an idle. i have the feed line ran off the back where the sending unit is and the sending unit for the gauge tee'd off of that. i just replaced the oil pump, pick up, and the oil pan with all y8 ones. my oil pressure is doing the same thing. i am not sure if it is just a faulty sending unit, or if the oil pressure is really that low. some one told me that it could be sloppy bearings, but i just rebuilt the motor with brand new bearings and seals, there is no nocking or pinging. when i rebuilt the motor, i checked all clearances with plastigauge and all was mint. any ideas? please help.