I have a 1978 Case 450. Having a hard time figuring out what aftermarket guages to get. I need a torque converter pressure gauge, a torque converter temperature gauge, and a transmission pressure gauge. Case wants $500 for 1 gauge! I think any oil pressure gauge will work for the torque converter pressure but not sure about the temperature.
Most the older equipment used mechanical gauges. If you search "mechanical temperature gauge" and several will come up. Check for length and probe/fitting size. Same goes with oil pressure
I like autometer.com brand gauges. There are some on eBay. ----> eBay link here
Stewart-Warner was good instrumentation back in the day. Now who knows.