I don't have an 03 PCM, but I know my 00-02 PCM did not have an oil pressure sensor. You can run a 3 wire ECT sensor (from a Camaro I think) with 1 connection to the ECM and 1 to the dash.
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.