I do that on boats so the captain doesn’t have to disturb guests while onboard. I use remote temp sensors, it looks slick and works well when implemented properly. That looks like shit.
I had one of his 6 gun tuners try to kill me. It set a crank position code and shut down my truck in heavy traffic in a major intersection. I had to remove the 6 gun from the truck to get it to start again. Only good thing I can say is I got a full refund from them.
Follow that hdmi looking cable back and see if there is an obd2 plug on the other end stuffed up somewhere. The other looks like a radar detector cord.
My neighbor has a similar wagon. I’ll have to snap a pic. He has a 351 on the spray, I can’t tell you how many people he has taken money from. It’s the definition of a sleeper. It’s bad ass! Nice work!