I used 820 ohms on mine, blue led for the switch light and red for the tell tale, I bought a selection pack and played about with resistors and bulb sizes to get the brightness I wanted. All in all less than a tenner from maplin and I have a bag full of each left over.
click
here
for a resistor calculator/guide thingy I used.
Top tip, I found it easier to pass one end through a hole then solder it to the back, if you do that slip some heat shrink over the leg before you solder it on as its pretty tight against other connections and any free play could short it, I blew a couple of fuses before I realised what was happening.