On our recent 7 day trip we decided to use our front cargo carrier with storage box. Since the weather was going to be hot I had some concerns about engine and transmission temps. My truck doesn't have a trans temp gauge so I invested in a Edge Insight CS gauge system. This product is plug and play simple. It plugs into your vehicles OBD2 port and can monitor all kinds of different information provided by the vehicles computer.
For this trip I decided to use the supplied windshield mount but plan on investing in the optional dash mount for a more factory look. I found the gauge information very useful and reassuring. On our way home we we're traveling up the grade on I 40 from Needles Ca to Mountain Springs summit in 109 dg heat. Cruise control set to 69 an air conditioning on. Trans temp hovered at right about 192.
The gauge can be configured to your liking and can display between 8 to 2 readings at the same time. I found that anything more than 4 made the numbers a little small....
Pictures below from internet...
Here is a link to a review on YouTube from Etrailer.com. I tried to insert the video but it wouldn't play and said to watch on YouTube.....
https://www.youtube.com/watch?v=QOyfPaszUvc
Erick