Oil Pressure?
 

Alright, I have this problem with oil pressure for 7mgte. From a cold start the car has fine oil pressure but once the car gets to running temperature the oil pressure slowly drops to zero (at idle). If you give it gas the pressure goes back up, then slowly back to zero. While driving, the car has good oil pressure. Oil in getting to the top of the motor and I do not have a knock. Whats the problem? thanks

Could be just the sender unit or the gauge, I would check the wire connection on the sender unit is clean and making a good contact first.
I would also look for any supras being sold for parts on Ebay and contact the seller for an oil pressure sender unit; I would have thought you could pick one up for a few dollars. Alternatively; unscrew the sender unit and fit a test gauge Link bit expensive for a one off test.

http://i17.photobucket.com/albums/b5...sureSender.jpg

Cool, I will give that try. Thanks Bill for the pic and info. That will make things alot easier.

maybe this is my problem too? Just got an 87 7MGE on an A340E tranny a couple of weeks ago. First car (of three) I've ever owned w/ a gauge for oil pressure... so I'm still not sure if there's a problem or I just need to learn how to read it..

When I start her up, the guage jumps to about 20 lbs... drive it for a few minutes, it could peak upwards of 40lbs... however, after I've been driving for a few minutes, the pressure seems to remain steady at ~10 lbs, but will go up the longer I drive it uninterrupted... :?