OBD Box

After a serious engine damage I want a OBD monitoring (Torque) to be active in the background while driving ... just as a dash for calculated engine load.
(Found nothing affordable within the net)
The problem is, that OBD in my car is always on - to switch the bluetooth adapter off I bought the cable on the photo from eb*y for less than 20€.
If you are not like me and always switch everything off while turning engine off - no problem... but I forget about that and so I decided to replace the switch, cutting clamp 30, by a relay externally powered via 15/31. I liked the idea of !not! interfering with the OBD-cables by connecting 15 directly.
The 13x19mm switch has on-off-on settings, so I can switch OBD on as designed, keep it off or switched by 15.

As TPU D58 shore was in my printer I printed it with that filament - does not rattle and is an eye-catcher within the black stuff of the cars dashboard - but the lid is too weak to clamp the cables. The relay cable-hole I created with