It's actually a small bulb and you have to take your instrument cluster
out to get to it.  It's not that difficult to do.  once you get the
cluster out you have to remove some screws that hold the LED & light
assembly into the cluster and then just pull the assembly out and you then
have access to the LED's and the little bulb.  If you have never taken
your cover off to the cluster (which you have to do to get to your brake
fluid) there are two recesses in the front of it.  You put your fingers in
there and you pull up and it will release (this usually takes more force
than you might think but it will come off).

Pascal
'84 Westy