Hi idrawcad,
I'm afraid it's a dash off job to access the back of the speedo, they are twist and pull . There's 5 of them. I changed mine to led.
The direct replacement bulbs are R509TBE beige base. The led's I used were T5 12vB8.5d. Slightly bigger and protrude a little further out of the back, but still ok to fit. They come with the little metal tangs straight so you need a small pair of pliers to bend them down, just copy the ones you take out if you go the led route. And as all led's they need the correct polarity, so fit and check before assembling the dash back together.
There are quite a few how too's on you tube powerful uk is one.
Hope it helps. Greg.
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