Here's some perfect bulbs for the 3 main dash illumination points (with the brown coloured sockets).. I had 2 old bulbs and one(middle) that had been replaced at some point. When I fitted my voltage regulator the two older bulbs both blew, probably after getting full voltage for the 1st time in years. So, I took out the bulbs and went to Halfords. In there I found that the right bulbs are type 501. As you can see I got 501LB(laser blue) cos they look alot brighter and now match my boost & oil temp gauges
Anyway, I wanted to get some new bulbs then take out the old ones and replace. I couldn't find any info on the correct bulbs on the forum here so I thought I'd post up the info now The 'ordinary' simple white bulbs are only £1.49 a pair but I got these 'laser blue' jobbies cos they're better for me and even then they were only £3.99 a pair. Getting them in is a very easy job too