My daughter has reported that the fuel gauge on her '86 Vanagon (AKA the
"Mystery Machine") is pulsing (slowly bouncing) between "E" and about half
full.  Any one care to comment on a possible cause.  Is there a voltage
stabilizer, or perhaps a ground issue here that may be a cause?  If so,
where is the stabilizer located, and where is the associated ground wires?

Thanks,
Ray in Alabama