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The lights were actually neon lamps and the stylist had their leads wrapped around the spark plug wi

By fawgcutter

The lights were actually neon lamps and the stylist had their leads wrapped around the spark plug wire to act as an inductive pickup. It’s also an old time trick used by mechanics to see if a spark plug wire and spark plug was firing. You can do the same with an NE-2 neon lamp on an older car that has accessible…

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Source: Kinja