You defiantly don't want to do that, unless your left hand drive?
You want to remove the wipers and scuttle panel and go through the big grommet on the drivers side bulkhead, you will see a black plastic box in the bulkhead where the main wiring harness enters the car, to get the pipes inside the car you will need to carefully drill a hole in the plastic. Make sure you seal round it again afterwards. Where you come through is right above the main fuse box, at the bottom of that is some lives and earths you can use.