Tom, you probably have at least 2 different connectors that carry signals between the engine and the gauge area.
1. If you can get the codes from the check engine light, it might help you isolate the area of failure.
2. I had speedometer failures and an transient oil pressure glitch that would shut down my engine, too. The connector to the engine controller was loose. The technology on those connects leaves something to be desired, to my way of thinking. It may not be a failing sensor but the engine's ability to receive signals from it.
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2000 Georgie Boy Landau 36' DP
2018 Equinox toad
KF5-NJY
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