Steve;
I would start by checking the ground connections on the clusters behind
the fuse block.These fail due water from winshield leakage. Redo any
suspicious ones.  Make sure the  clusters have good contact to the
chassis. I'll bet a doughnut your headlights work better when your done.
Check the ground connection on the:
1>engine straps
2>radio
3>shield in the antenna cable

You might also have a resistor end going bad on one of your sparkplug
wires. I wold unplug them one at a time to see if it stops the
interference.
Drive Safely & Good Luck
Ken Lewis<K-ville,NC>
86 VW Transporter Double Cab Pickup
60 Porsche T-5 Coupe
85 VW GL Vanagon<Elvis>lives again!

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