5mm t-piece from memory. I bought the autogauge boost gauge from halfrauds; which is a damn good match for the lcr dials. it comes with a t-piece and some vac-pipe (not sure on the size, but fits their t-piece and gauge) which is long enough to reach fpr. However, the vac-pipe is see-through plastic and looks a bit cr*p so you may choose to replace it with something better quality - http://cgi.ebay.co.uk/RED-Samco-Vac...39:1|66:2|65:12|240:1318&_trksid=p3286.c0.m14 or similar. That t-piece is the same t-piece you get included with the gauge, and the anti vibration thing is a gimmick as far as i can tell!! never heard anything about vibrating gauges before!
Hello mate, how you doing, I hope all is well. Got my Boost Gauge, its the Auto gauge one. It comes with two wires, a red and black. Do you know where I can connect these to, I wonder if you have any pics of how to connect the wires and to where? Much appreciated.