I speak that language.... http://www.peachparts.com/Wikka/R170HeaterDashLight
using a small screwdriver and a soft cloth between the chrome ring, pry the control knob off.
the picture shows the bulb behind a small metal flap that covers the bulb
you must push the flap out of the way and pull the bulb out (not easy)
the bulb is Sylvania #2721