Wiring the Rear Camera Under the Car, 3M Dual Lock for the Fuse Box Cover

TL;DR Not much fun has been had 

First task at hand was just a nice to have : a proper routing of the cable to the rear camera. When I did install the dashcam kit last year, it had been a hurried job one winter evening. Squeezing the cable going to the rear under the side of the tunnel cover was ok, but from there the only way to the boot area was going across the panel behind the passenger seat to reach the post where a seat belt would be attached.

As most would happen under the car, I did lift the rear on the ramps, and the front with the hydraulic jack. It's snug but I just fit ok under there. 

I'm lucky that the wiring to the rear camera ends with a connector I did attach to the back of the chassis right under the boot cover. The camera didn't need removing and the wiring attached to the roll-bar could remain as it was.

So the rear unit was disconnected, the wire pulled back to the cockpit and pulled down from the right side of the tunnel, quick and easy. In the boot, electrical and duct tape had been used to secure the cable to the chassis. The electrical tape came off cleanly, but the duct tape left some white viscous residue. That was (dis)solved with some brake cleaner and paper towel.

My intention was to attach the camera cable to the main chassis loom and fuel hose from below the car, along the top of the transmission tunnel. The yellow video connector was slim enough to go through the main rubber grommet through which the main harness and wiper fluid tube go from under the car to the cockpit through the tunnel top.

Once under the car, it was quite a pain to reach for the main harness and place new zip-ties : it's very narrow and quite difficult to reach. But I managed to do it properly, mostly with my eyes closed, feeling what I was doing with one arm coming from either side of the gearbox. The next part along the propeller shaft was not easier, far from it. Once in the vicinity of the handbrake, I took care to remain consistently as close as possible to the main harness and fuel hose.

Entry to the boot was not an issue as there are wide enough openings where the diagonal members of the back panel reach the bottom of the chassis. So I went through there, then followed the diagonal beam up to the top where the connector from the camera was still attached.

I chose to attach the extra length of video cable under the car rather than in the boot like I had done last year. Only a straight length is attached to the diagonal using 2 pieces of duct tape. The rest is tucked under the boot and secured with a few zip-ties.

Second task was the fuse box cover falling down... again. I had already replaced the Velcro in March last year, thinking that it was "good enough". When it fell a few weeks ago, I assumed my old stock of TESA was not much sticky anymore. But I was mistaken, and the biggest problem came from the lengths of "loops" that had come with the "Soft Bits for Sevens" tunnel pocket. It was still tacky but didn't really stick to the firewall.

I was lucky to have the Amazon delivery man come by just as I was done with the wiring of the camera. So I moved on to the fuse box cover. This time I would be using 3M Dual Lock tape.

Removing the glue residues from the cover was a real hassle. WD40 worked best at dissolving the glue, and wiping with paper towel took a while. After that, I degreased with brake cleaner and finished with a window cleaning solution. The firewall was degreased and cleaned as well.

I cut Dual Lock pieces using the original pieces of Velcro as a reference for the length, and stuck them to the fuse box cover. As the tape is 25mm wide and the lip of the metal cover is maybe half that, I decided on reusing the old Velcro and glue them back to back.

As for the firewall side, I did align the cover in place and located where the right hand part of tape would need to go, pressed the adhesive firmly in place, and aligned the left part by leaving a space "2 thumbs"-wide between them.

I finally "clicked" the cover in place in the Dual Lock against the firewall. A very satisfying feeling.

See below a close-up of the tape, I'm pretty sure that it is what they use to attach the cover of the OEM Momo steering wheel.