Look for a source of switched power that is unused in the fuse box (often there are a couple of fuses unused because of options, like seated seats or similar), then tap in and run a wire. Remember to write down which fuse now powers the gauge sensors.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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