Aftermarket gauges
I run an aftermarket temp gauge in the top radiator hose. They used to be pretty common. Works really well. A lot of folks don’t like them because you lose function of the gauge if you lose coolant. I still have the stock gauge hooked up for that. If you want to run two temp gauges there isn’t much choice other than an adapter that goes under the thermostat neck that is tapped for a sender.
I run an aftermarket temp gauge in the top radiator hose. They used to be pretty common. Works really well. A lot of folks don’t like them because you lose function of the gauge if you lose coolant. I still have the stock gauge hooked up for that. If you want to run two temp gauges there isn’t much choice other than an adapter that goes under the thermostat neck that is tapped for a sender.