run a wire to the battery, connect it to a relay and then trigger the relay by ignition. Put a 5amp fuse in line from the battery. Output from the relay goes to your sensor and then connect sensor & relay to ground.
Without knowing what exactly it is I wont recommend anything else cause the risk of causing other issues can be too much.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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