390ohm resistors for LEDs seem spot on to me in terms of default brightness. Never quite sure why people feel the need to fit bright dash bulbs. I know clocks suggest I have a diesel (I don't) but my dash pod was scrap so had to source another recently. Petrol rev counter obviously (recent swap).
Also, I had thought it would be a neat idea to provide clock power from dash light circuit for convenience and to help remind me my lights are left on - ie if I can see clock, my lights are on. However, I found dimmer/rheostat interfered with it both in terms of causing it to flicker and not returning a true battery voltage (some of it lost in dimmer I guess). It displayed 11.11v which I know isn't right as I tried clock across battery and it gave an accurate reading that matched my digital multimeter.
It therefore need a separate 'raw' supply to display the correct voltage. In fact thinking about it, although the dimmer itself was actually useful when dash used tungsten bulbs for lighting (due to them being over-bright at times), I can't see any merit at all in retaining this feature now I've gone to LEDs as the light is absolutely perfect as it is. Besides which, dimming of LEDs is hardly linear even if I did want to dim them. It would make more sense to bypass the dimmer altogether as its no longer needed - may just do that.
The unused diesel LED could become a 'lights on' dash indicator instead.
More thoughts: I suppose you could mount clock further to the left, fit a rocker switch to the right of it and then you'd be able to check state of both starter and leisure batteries but to be honest, that was enough for me.
Clock looks better than it does in photo.