I know several folks have posted their marking gauges in the past, I though I would add to the list.
Here are several marking gauges I've been playing around with. Left to right in the order I made them.
MarkingGauges10-2014-Small-1.jpg
The first was made from some cherry and maple scraps. Mostly cherry, with the facing being the maple. The knob on top is made from a 1/4x20 brass screw and some lilac. (There is also a small shoe of lilac inside to keep the screw from damaging the cherry beam.)
CherryMapleCuttingGuageSmall10-2014.jpg
The next is a panel gauge made of oak and a bit of elm for the facing. Same type of lilac knob and shoe. Sorry for the blurry image on this one...
PanelGaugeSmall10-2014.jpg