Temp and amp gauge for 67 Dart cluster

I'm looking at ways to try to put an oil pressure gauge in my dash cluster to get rid of my bolt on gauge pod under the dash and have an idea on converting a temp gauge to read an oil pressure sender. I'd like to mess with a spare one that works. Would prefer something in decent shape as I'd like it to match my current gauges that are pretty good (letters still pretty white, needle can be faded as that's easy enough to repaint). Also looking for a spare ammeter gauge as the oil pressure dummy light gauge face is connected to it as I understand. I'd rather not cut my current one up in case I can't get things to work and want to go back to stock.