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Mine has an O ring on it. Doesn't seem right. Seems like the O ring is preventing the dust cap from fully seating inside the hub.

Thanks Dave. Car would either not start unless holding the ignition switch in just the right position between "Start" and "Run." Sometimes it would run and then just die as if it was out of gas or...

The guy from DMC says to jump the black and the black/purple. See here at 12:40:

https://www.youtube.com/watch?v=gRjOu6Zi3Gw

"You can test your gauge by simply connecting the wire to any grounded part of the car such as your engine."

And what should the test reveal?

My driver’s door did not operate the door ajar light or the overhead courtesy lights. Passenger door everything worked which ruled out voltage and bulbs and fuse. In my car even the working lights...