the 194LL bulbs work well
the tach has it's own weird bulb and I haven't been able to find a brighter replacement
the turn signal and high beam indicator light bezels are GLUED into the dash (with huge globs of glue) on a Superformance. Good luck getting them out!
I have designed a bracket that mounts in front of each gauge and holds a small candle. It looks very British and works quite well as long as the wind doesn't kick up.
One minor annoyance is the hot candle wax dripping on your legs if you tend to drive with shorts. If you are into BDSM, so much the better
--Mike