Hi Alian 23, I've fitted both my 330 P4 and 412P (same car) with chips. I've agreed to repair a 412 that I sold earlier and waiting for Underpan to arrive. I'll take a few pics to show you if I can. First you have to shorten all the wires. I normally cut the guide/blade wires and solder to the corresponding chip wires and same with motor wires. I place the chip laterally behind the front wheels where the ledge of the floorpan is and secure with Blu-tac. You have to check wire lengths and solder them to chip and motor, don't forget to heat-shrink on all solderderd wire-joints. You can use a glue gun to secure the wires to the floorpan. I think there is a pre-existing hole by the ledge where the IR lens fits, if not drill a 4mm hole centre of F/pan where the ledge is. It's a bit tight, but is 'do-able'. Hope that helps
