Heh. Peel and Stick aquarium thermometers. 50cents each. No wiring required. Just put it in the corner of your driver side window by your shoulder, out of your air / defroster vent flows. It will be close enough. Unless you have to have an exact number or gadget.
https://www.amazon.com/Fashionclubs-Aquarium-Thermometer-Sticker-Stick/dp/B01MZ0H722
Lots of weather station -type options as well as temp monitors related to RVs and battery banks.
Those fish tank thermos have an unrealistic temp range unless you live in San Diego. I need something that goes from -30F to +110 F
Yeah that's such a cool idea though!
I actually bought a wireless probe/readout combo but the readout is huge. I can't find a good spot for it in the vehicle. The blue sea unit looks great though.
The wife wanted an outside temp gauge for her little Rav 4 a few years ago. Here in cold country, we have nasty freeze-thaw-freeze winter conditions, so its nice to know where that temp it, specifically for road surface conditions.
I took a chance on a cheapo chinese item, shipped from china.
This one:
http://www.ebay.com/itm/Car-Auto-LC...ash=item58b6b83b2e:g:G5gAAOSwnONZC4fg&vxp=mtr
It was the only one I could find that was back-lit, and hardwired 12vDC, and hardwired outside semp sender.
Turns out, the little things are pretty nice.
Ive got one in every vehicle we own now. :ylsmoke:
I have this same one. I put the transmitter in the fridge so I can keep an eye on it and the receiver up front with me. At least I know how hot it is in the truck.
Darrell