I assume the "rubber piece" you refer to is by the steering shaft through the firewall with one large harness running through it. This rubber boot is large. You can take a phillips screwdriver and "punch" through it, run your wiring through & then seal up with silicone. Just stay an inch or so away from the existing harness. It's easier if you remove the driver side hood support bracket & fuse box cover.
__________________
Jonahs
|