A few weeks ago I notice the needle was vibrating except when it's pegged out at 3 bars.

Now the thing says I've got 3 bar after sitting dormant for two days. I started the engine and removed the oil cap on the valve cover to see if it was really pumping oil. I drove it a short distance then cut the engine to see if the false reading changed. It jumps to 3 bars as soon as the ignition is turned on.

Has anyone ever seen an oil pressure sending unit fail and cause this problem?

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84 300SD
85 380SE
83 528e
95 318ic