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Old 07-08-2019, 07:00 AM
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SC/397 SC/397 is offline
Join Date: Feb 01, 2010
Location: Michigan
Posts: 835
Like you noted - install a mechanical gauge on it and monitor it again.
A stuck Oil Pressure Relief Valve can cause a spike but I wouldn't think that it could cause fluctuations like that unless the spring is broke or something. I have never seen a broke one so that is unlikely. It does sound like a electrical issue in the sending unit or gauge to me.
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