hi, just saw your message- i'm not good with that! I use the OBD fusion app on my iphone- I use it with my van, my pickup, the prius, reset a trouble light for a friend...reset a light in a rental car (!). the "dongle" I use is a $15 amazon I have a couple they all work kinda the same- occasionally they drop connection- on trip I use my old iphone dedicated to display for the OBD- there are many many data view options
Sounds logical... maybe at the panel may get warm. My controller is not wx proof so would need to be inside or well protected and still have room to breathe. My problem is finding a route up thru the floor near the left rear of a 210 Pop... have you bored thru anywhere near there?