Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
It is quite common to pierce the large oval harness grommets as part of the harness, but through the flat rubber next to the harness.
There is not many other ways.
If yours is an auto, have a look at the firewall where the clutch master cylinder would go, if it was a manual transmission.
I would look up under the dash where the bonnet cable goes through the firewall.
Accelerator pedal harness etc.
There should be a spot within an existing grommet that you can poke a wire through.
Do you need any further help?
I hope my advice has been of assistance to you.
How did you go with your installation?