Infinity Box ( used to be ISIS until Isis became bad) manufactures modern electrical systems for vehicles. Instead of individual power leads, relays and switches you have a master control module that connects to power control modules in the front and rear of the car via a CAN bus (4 small wires that carry millivolt signals). Each power control module has 10 independent power outputs that turn on and off with signals from the master module each output is individually fused. I also have their interface module that plugs into the master module with a CAN bus this module has a wifi signal unique to it which allows me to pair it with any wifi device (password protected) to control all switch functions.
The reason I have to tunnel open is so that I can install the bracket that will hold the push pull cable connected to the PCS wireless shifter controlled by the paddle shifters.
More info available at
https://www.powertraincontrolsolutions.com
http://infinitybox.com
Ps..I am NOT getting any good deal for putting this info out, I have been very happy with the quality of the products and customer service provided.