If anyone is interested in either of the gauges but was turned off by the price, I just listed one of each gauge on Ebay starting at $9.99 with no reserve. Also, I removed the paint on an oil pressure gauge bezel and the bezel is a silver color under the paint, not brass.
Here is a picture of a oil pressure gauge with the paint removed from the bezel:
NOS Oil Pressure Gauge
NOS Stewart Warner Temp Gauge
Thanks and good luck,
Jason