hello all i was wondering if there is a way to test my oil pressure gague. my 88 GL wagon was working normally then the other day i couldn't get it go above 45 psi even when i revid the motor up to 5000 rpms. i have let it set for a couple days. and today when i started it to move it. the oil pressure seem to work normally. i have look in the boks i have and didn't se anything that would help. you guys have any idea for test i could do or what the couse could be. thanks Jerrod

Hook a wet gauge to one of the plugged fittings on the pump.