Make Your Own Marking Gauge
Why bother? Because this one works better than anything on the market
If you haven’t found a commercial marking gauge that’s exactly to your liking, take a page from Matt Kenney’s book and make your own. His version cuts a much cleaner line across the grain than a pin-style gauge, and won’t catch a grain line and get off track when cutting with the grain. It has a spear point, so it can be used in both directions, and an easy-to-adjust thumbscrew. When you make your own, you can locate the thumbscrew and shape the fence to fit your hand, and you can make different sizes for specific tasks.
From Fine Woodworking #211