Wiring a Thermometer

I want to wire a thermometer into my truck. My plan is to mount a probe in front of the radiator and mount the LCD screen into one of the empty ports to the left of my steering wheel feeding the wire though the firewall.

Has anyone done this? Which thermometer did you choose? How did you wire it? How did you get through the fire wall?

Here's what I'm looking at....

$18 HOMREE DC 12V 0.56" F/C LED Digital Car Meter Thermometer with DS18B20 Digital Thermal Probe/Sensor (Red)

https://www.amazon.com/HOMREE-Digit...074035&sr=8-24&keywords=led+thermometer+probe

 

What temp are you trying to get? You said in front of radiator so its not coolant temp but it if your going for ambiant temp may pick up engine heat so not always accurate for this granted f150s did this but programming ignored the temp when at idle.

 

I'm looking for ambient temp. I read somewhere that putting the probe in front of the radiator would be best, but I'm open to suggestions.

 

Years ago I wanted something like that I ended up with a cheap wireless indoor outdoor unit from Radio Shack.

It took batteries but they lasted quite a long time I mounted the outside part on the bumper.

i used that for years before the vehicle expired .

If this is a mechanical gauge make sure the wiring is long enough to run it just where you want

 

You can certainly get ambient temp in front of the radiator but you will likely notice its a little over when your at idle. That's the only downside I know of