I've only seen the compression testers that fit into the glow plug hole.
Let us know if you find one that replaces the injector as the long thin TDI glow plugs have a tendency to break off during removal.
Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)
"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"