glowshift

Has anyone used the gauges from Glowshift? They offer pillar-mounted gauges and vent gauges. I have been eyeing their oil pressure gauge and fuel pressure gauge. The vent ones look pretty good and they claim they still let air pass through. Here is a link...

Anybody have any reviews on the GlowShift gauges? I have seen mixed reviews online and am wondering if they are worth it and accurate.