It's not just a vacuum gauge. Notice that if you aren't moving, it reads zero mpg. A vacuum gauge would still indicate vacuum. OK, so it's not a real trip computer, but I feel it is useful. Hey, I see you are from Wisconsin and a new SL owner. Is your car white? Did I see it parked at Bally's? I saw a while SL 320 in the lot there with a dealer temp plate on it.

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