[chubbyranger]

There aren't too many aftermarket options for Deville given the usual owner demographic, particularly for gauge clusters. IIRC the car may actually monitor oil pressure in PSI even if you only have an idiot light, but its only available when you run diagnostics. IF you could find a gauge setup calibrated to that sender it would be an easy wire tap and mount, but first you'd need some research on the sender. Can't say that I've ever seen that mod posted here before.