I just purchased 2 of the most inexpensive gadgets for my RV that greatly improved my RVing experience and driving.
One is an OBD2 port reader/gauge/diagnostic tool/code reader & code clearer and temps & speed alarm etc...! All for only $36!
https://www.amazon.com/dp/B07L8RPLCG...ing=UTF8&psc=1
There are many on the market. I do not like idiot gauges and needles with H & C for monitoring temps. Although this isn’t perfect, it’s certainly better that what I had! And now I know outside temps too!
The other is a Bluetooth battery monitor that alerts you on your iPhone when your battery is at the percentage you set it at, and tells you of CCA issues, let’s you know voltage and charging status etc...
https://www.amazon.com/dp/B07GP1RXYZ...ing=UTF8&psc=1
This device is also on the lower end of the price point, but once again, it sure beats not having anything! Although it’s on Amazon for $32 in this link, I purchased it new, off eBay for $19!
Happy camping!