Pieces/parts

VDO 80 PSI oil pressure gauge 350 104 $21.98
VDO 80 PSI oil pressure sender with 7 PSI warning contact 360006 $27.98
The above items were purchased from BCI 800-533-1320

VDO Single A-pillar mount 240347 $24.71
The above item was purchased from http://egauges.com/

BMW Air bag blank with chrome ring 51 16 2 497 678 $32.75 retail.

I used number 14 wire for the ground and sender wires. You also need a wire for dimmed lighting and power in accessory run and start. Dimmed lighting is any gray/red wire. Accessory run and start is any violet/whatever color wire. Not whatever color/violet wire.
Not sure if the following works every time. In general any red wire is hot at all times ahead of the fuse. Any red wire/whatever color wire is after the fuse.
Any green wire is hot in run and start ahead of the fuse. Any green/whatever color wire is after the fuse.
Any violet wire is hot in accessory run and start ahead of the fuse. Any violet/whatever color is after the fuse.
If your not sure of what your doing wiring your car, have someone that is, do it.