low oil presure, what could it be?

[89' RICE COOKER]

haven't posted on here for a while. well my problem is, when i start my car when its cooled, my oil presure is good(about 2/3-3/4 on the gauge) after about 10 or so minutes of driving the presure goes way down(especially just idling) to almost the red line. Does Anyone What Problems would cause this? any feedback would be helpful. Thanx in advance.

 

[ka0tyk]

are you reading the stock gauge? most likely your stock oil pressure sending unit has gone bad. the oil pressure should remain constant like 40-60psi at idle and then like 5-10psi for every 1000rpms after that. try replacing your stock sending unit or buying an autometer oil pressure gauge for a more accurate reading.

 

[lit_mike_2001]

hook a mechanical gauge up to it, the stock sending unit is a pos