Congrats. Sarcasm is free.
I didn't see a question, so let's play the guessing game.
Do you need to know how to mount a gauge to the dash?
Do you need to know where to run the power wire for gauge light?
Do you need to know where to install the sensor on intake and or engine?
Do you need to borrow some tools?
I feel better after unloading sarcasm.
Now, I'm going to assume it's water temp.
if it's electronic, you can just remove the stock sensor wire from on/near the waterneck/thermostat housing and plug in the new wire.
If it's mechanical, you will need to install the new probe into a port where it can contact the water.
On my old 3.8 (1997) I changed to an aftermarket waterneck that had a spot to screw in a temp probe.
On my 2003 gt, I haven't upgraded gauges yet, but the water sensor is on the front passenger side of the intake. I will add a pic of my gt so you can see the placement.
With this type, you can just add your wires to it (splice them in) and keep both the stock gauge & the aftermarket.
Or just remove the stock wire, then the stock sensor, then install the new stuff.
it's the black wire near the alternator. (almost center right of the pic to the right of the pink fuel injector)