It can be done a LOT easier. For many years I have the 'torque' app, costs a few euro/dollar. You get an OBD2 bleutooth plug. Then you get 'trackrecorder' app from the playstore [free].
You can set up the outlay of the screen meters, so RPM/ TURBO BOOS / TIRE PRESSURE , anything that the OBD2 passes on.. Then you simply go into Torque, choose 'trackrecorder',
and your phone takes the role of the GoPro and records the roadmovie with the meter layout from Torque over the roadmovie, LIFE ...

This is what you get then :

 

Guys, who has the " RERUN APP" for android .. ..could you email it to me as its NOT in the playstore anylonger..
I had it in march, but as I wasn't planning on getting a GoPro I deleted it. Now I have a GP, but the app had
mysteriously disappeared.. JLR even states it has '..never been available..' ..

Anybody out there who has it ?? As I have years of guarantee ahead, I don't want to fiddle with the OBD2 plug..