Ok - here is the lowdown on the gauges
Things you need to know about VDO GNX gauges depending on how old the gauge is, is going to determind what socket is used along with what bulb is used. Listed here are the 3 different sockets that can be used:
My reference and work I did to find out about my build, I went to
www.egauges.com
Part # 600-813 type a plastic bulb socket
Part # 600-819 insulated light bulb socket
Part # 600-840 insulated light bulb socket
These are the 3 different sockets that can be on whatever set of gauges you end up with.
On my install I had 600-813, small socket
For the tachometer, boost gauge, fuel gauge and water gauge - BA7 light, 5 bulbs needed
For the speedometer - BA9S-5SMD, only need one
On our oil pressure gauge, which is a new design, we used a 194-6, only one needed (due to this reason, it may shine slightly brighter than rest)
(NOTE: Some LED's will not fit perfectly into socket, some top trimming of the socket may be required for bulb to make contact)
(NOTE: on all gauges except speedo, make sure that if the bulb doesn't light up, switch the black and gray leads... Some lights are tricky and won't work depending on where you plug them back into)
You can buy additional bulbs with lower lumes but it can be hit or miss.
But that's it folks.
Any questions if you do this upgrade, just send me a PM.