I think they are electric. The back of the gauge only has 2 wires, and no vacuum nipple. I think it's specific only to S15's too. You can use the holder in S14's though, but you have to cut the top bit of the plastic to fit.
Not much of a DIY tutorial. I just mod a 4 spoke mitsu steering wheel that has a bigger brass horn contact by adding old brass contact from my 3 spoke lancer steering which got cracks and sunburn. Used some copper...
The M-Spec has been on sale since the 8th of, 2001 and is the result of the first change to the GT-R made by the new team of engineers headed by Kazutoshi Mizuno (the former chief engineer at Nissan Le...