According to my calipers, the RevBurner V2 has 3.25mm mounting holes, if the Pro Gauge has the same diameter holes, M3 wouldn't fit according to
this chart as it requires 3.4mm clearance. M2 only needs 2.4mm so should fit fine.
If by MB's you mean motherboards, those standoffs are 3.4mm diameter(so presumably M3) and don't fit my RevBurner.