kst8engineer

iTrader: (6)

For some reason, although my oil pressure reads good on the Trans Am gauge, my AutoTAP is showing zero oil pressure. AutoTAP says it's set up to display a 0-5V signal for oil pressure. Anybody have any idea why the oil pressure isn't coming through to the AutoTAP?

cherryelky305

iTrader: (2)

if autotap runs through a dlc, and your working with a 4th gen trans am. Then the pcm never sees a oil pressure signal so it cant send oil pressure through the dlc. the sensor is only hooked to the gauge, it never goes to the pcm.

kst8engineer

iTrader: (6)

...sometimes the simplest answers are the best! Thanks, you're right. I had mis-read the instrument panel schematic and I was thinking the oil pressure gauge was getting its info from the serial data line, like the coolant temp, fuel, tach, and speedometer. Looking back at the schematic, I see you're correct.

FYI, it's in a '71 Chevelle running '99 T/A running gear and electronics, and yes, the AutoTAP runs through the DLC.

Thanks again for your help.