This Rubber sender gasket works a lot better than the old cork VDO one.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
VDO 226 053
The sender is approx centered. I used and Endoscope attached to my phone to locate the direction the wiring came from to the sender (from the right on my car). I then drilled 4 corner holes with various step Uni-bits. Be careful the tank is approx 3/4" below the trunk.
Used a cutoff wheel on a Dremel to cut a 6x6" opening connecting the 4 holes I drilled.
I used a Rivnut puller to install nut-certs, and attached a .063" alum cover plate. I used fuzzy self-stick Velcro in the underside of the plate to prevent grounding of the Sender wiring.