SRAM NX EAGLE 1×12 11-50T 12s speed Groupset Kit Trigger Shifter Rear Derailleur Cassette Chain
not include the red gauge!!!
Here’s the user manual from sram official website, which indicate the method for chain gap
adjustment without gauge!! just make sure the gap between cassette and pulley is 15mm!!!
1.SRAM NX EAGLE 12 speed right trigger shifter. x1
2.SRAM NX EAGLE 12 speed long cage rear derailleur. x1
3.SRAM NX EAGLE 12 speed PG-1230 cassette 11-50T. x1
4.SRAM NX EAGLE 12 speed chain 126 links with power-lock. x1