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.
Recently i wanted to fix a 4 point racing harness in my car. But i couldnt
find anywhere selling a FIA homologated eyebolts to mount the harness.
Anyone noes where can i get them. TQ.
Just wannna find out if there will be any noticable gain in performance (hp's, throttle response and etc) if a CAI were done on a turbo engine? Wats your experience ?