Jeff
You can get paint pencils from most full-service craft stores (like Michaels or
total Craft). They come in several colors and are just like a regular pencil
except the "lead" is a slightly waxy pigment. You can sharpen them with any
normal hand-held pencil sharpener. Once you've got the panel painted in it's
base color, paint the instrument dials painted black.
When that's dry, take the appropriate color pencil and lightly draw right on
the raised dial markings that you want to highlight (make sure the pencil point
is good and sharp). When you're done, put a drop of future over the dial face
to protect the paint pencil markings ans simulate the glass and you're done.
The end result is quite nice and convincing,
"The world would be a much simpler place if every one could pick
and choose their obligations, but we can't and we shouldn't."
Major Charles W. Whittlesey