"A '90 240 doesn't come with an oil pressure gauge, and its stock warning switch is set at 0.5 bar (7 psig) so your added gauge sender is always a suspect tracking over long term, especially as to the 4.5 bar history"
In other words, check against a known good mechanical pressure gauge before jumping into the work needed to pull the oil pan. Gauge sender and gauge, whether you got it new or used may have had a fault.
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Art Benstein near Baltimore
A woman marries a man expecting he will change, but he doesn't. A man marries a woman expecting that she won't change, and she does.
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