i put one through the other day without drilling
ive got a 1.6 so might be different
this is what i did:
under the glove box is a plastic cover with 2 plastic screws in unscrew the screw and take the plastic thing out. Then get you head right under (have a torch handy) and look for a thick cable coming through. once you spot it get a metal coat hanger and straighten it out and poke it through about 8 inches the co look in your engine bay and at the top right you shoould see the coat hanger.
now wrap the hanger as tightly round the power cable as you can and the from inside the car pull it through keep trying untill it works
if you want me to take some pics i will
Deano