I am not aware of amy miter gauges that fit a t-track slot but you may be able to adapt one by replacing the bar that rides in the mitre slot.Mine is a "work in progress."
It ain't gonn'a be pretty but I hope it will be functional. I just put a phenolic plate into the top of an existing workbench. I have routed a track along the edge of the bench for featherboards. Tracks for a fence are next.
Pics at Photography of Terry Danks-Woodworking
The tracks I am using are ones from Busy Bee: Busy Bee Tools Product Detail
Uses standard 1/4" - 20 hex bolts
3/4" x 3/8" requires 3/4" material for flush mount
Does anyone know if there are miter gauges made to fit small tracks like these? I would like to make a sled for doing cabinet rails but am unsure if I should be using tracks like these. They seem smaller than "standard" table saw tracks.
I used a combination miter slot/t-track on my table so it has both in the table as an integrated piece. Rather than top down screw mounting it mounts to the table with 1/4 - 20 hex bolts from the underside of the table. Looks good and no screw heads to get in the way.