So, at a net cost of about
£7, I took some stock rev3 turbo gauges (with a custom AFR/Volt gauge in the boost gauge location) and made them look like this at night:
The concept is pretty darn simple really.
1) Get some white LED bulbs in the cluster.
Any one of these designs will do the trick.
The light spread is very important and no other LED bulb I've tried compares to these when used in the cluster.
If those exact ones are not available then try to find others with similar flat construction.
2) Get some coloured lighting gel for the colour you want your speedo to be.
No reason why this has to be a single colour either as you can design any colour combo you want. Although the nature of white LEDs means blue will probably work best, people have had good success with green and others have made the red of the rev5 gauges redder.http://www.amazon.co.uk/gp/product/B000L9CR7O/
3) Having disassembled the clocks, cut the gel roughly to shape and carefully slide the gel between the clock face and the clear perspex backing.
(With the speedo and tacho, I'd be extra careful to hold down the needles, as resetting them accurately once they've popped off is tricky and annoying)
This will only tint the light going out of the faces, leaving the needles to be a slightly light shade of red and the odometer a very clear white.
This will work brilliantly on any part of the clock faces that normally illuminates white, but the red or orange parts of the face might not work so well, as you can see below in comparison to the shot above:
4) If it bothers you and you have the patience, you can carefully cut out holes in the gel to let light through untinted to the coloured parts of the clock face, as you can see I have done above.
These is almost no margin for error when cutting out the redline on the tacho, so once you've cut the gel and positioned it on the face correctly you may want to use a piece of clear sticky tape to hold the gel in position.
The result is a very simple, stock looking gauge which illuminates to match your colour scheme at night.
They have very slight hot/cold spots... but for the money you'd forgive their minor imperfections.Plenty of people have done this successfully now, and people generally find it very easy.
Of course you don't get the options of graphics like on speedhuts, but speedhuts don't give you the red-line when illuminated at night. All in all, after alot of other experimenting with the cluster, I'm very happy with the end result on these 
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