I was just wondering if anyone knew where to find the test port for the engine I couldn’t find it online anywhere

 

Test port for what??

 

I bought a gauge for engine temp and it said find the engine test port sensor

 

There isn't one.

Your truck only has one temp sensor, it's either next to the heater hose, on the passenger side of the intake, or, just to the drivers side of the thermostat housing. (real fun to get to if you have a/c.....)

What problem are you having?