hi,
i have a new saber gauge, where you can set boost peak and also has recall. It changes to red when it hits your boost desired "redline" and beeps at you.
found it to be very good
i fitted this into my 33 with ease.
also fitted one of the older ones with no peak detect, just that standard one, also works very well.
as far as visabilty, in the rex i mounted it in the vent on the drivers side in the dash, its quite hard to see in daylight, but in the skyline, i mounted in on the pillar, and its pointed directly at me, its a breeze to see during the daylight, they only sorta become a issue when they arnt pointed at you.(note, at night you can read in the car behind lol) if that makes sense!
i love them, couldnt be happier.
saber gauges FTW