Wire up a simple 12v rocker switch to the fuel pump circuit/fuse, job done. Hacky, but it'll work. If you need something fancier, a remote start/stop system is probably a much better way to do it.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth