did you hook up the sr5 gauges w/ the tach and not disconnect the original idiot light sender? if so your oil pressure gauge is probably broken b/c it was fully grounded. i thought the lines for the aftermarket mechanical oil pressure gauges were polyurethane tubing not copper. the copper lines are usually used for the aftermarket temp. gauge.

87 22R PU, 2? body lift, 33? BFG muds, 4.88's, F&R Lock-Rights, Rancho Shocks, EB's Street RV Head w/ 268 Cam, LCE Header, 2" to 2 1/4" exhaust, Flowmaster 50 series, Magnaflow high flow cat, complete Herculined SR5 interior, V6 BB, MC, and calipers.