Router Table Miter Gauge... how the heck..

I register against the fence and push through the cut with a sacrificial backing board.

-- "Bordnerizing" perfectly good lumber for over a decade.

I use sleds that register against the fence or against the edge of the table. But lots of guys do use a slot, it’s just a matter of preference. You already have the slot, so you could build a sled or gauge that uses it – just cut a strip of hardwood to fit.

-- Coffee is best with a fine layer of sawdust on top. -- http://www.north40custom.com

I would second Doug’s approach. I never use a miter gage on my router table – just back the piece with a square piece of scrap MDF or such and register it against the fence. This also has the advantage that the backer can act to lessen any possible chip out you may experience.

-- Mark, Webster New York, Visit my website at http://thecraftsmanspath.com

Pretty much Douglas has it. Usually I make a jig / push block and register against the fence. The push block can be as simple as a squared up 2×4, one face against the workpiece (holds the workpiece square and acts as the backer board to help prevent tearout) and one face against the fence to hold everything square as you pass the bit. If you have a longer workpiece and you’re cutting the short end, like a drawer side, it works easier to make a square of 3/4 ply or mdf maybe 12×12 and screw a handle to it. Basically you’re making a gauge that registers against the fence instead of a slot.