If you are careful, you can re-use the black plastic base for the dash
bulbs and replace them fairly cheaply.  I broke the soldered on leads on
the bulb, removed it, bought cheap and very similar bulbs (without the
base) at an auto-parts store (bring the bulb and base with you ;) and
replaced it.  It was just a matter of bending the new leads straight,
carefully threading them through the base and folding them up where they
were soldered.  Once the whole unit is put back in the dash, the
connection holds the leads in place.

Rob
'89 Westy