Can't get that Buzzing out of my head

[dswalterwi at earthlink.net (Don Walter)]

I have an intermittent buzzing from the Gauge cluster.  I believe it is linked to the oil pressure.  I'm not sure if it is related to too high or too low of pressure.  It doesn't occur at idle but rather while driving and not all the time.  Also the oil pressure light does not light up or flash when you first turn on the key.  Above the Oil filter is a dual oil pressure sender.  That drives the stock warning lights and the other is a 5 bar gauge.  The gauge always shows good pressure, 3 to 5 bar while driving and around 1-2 when idling.  I'm not sure where to begin to resolve this problem.

Don
1984 1.8 8V Pewter Scirocco (sold years ago)
1986 2L 16V Toronado Red Scirocco (under repair)
1986 1.8 16V Toronado Red Scirocco (for sale)
1986 1.8 16V Black Scirocco (my new ride)