Pittsburgh dial gauge holder for my mendelmax 2.0. The holders available required that i undo my hotend. mounts off the front of the x carriage and utilizes the back mount on your indicator.
use m3 screws and nuts to mount to x carriage. in the pic, i only had 25mm screws but a 15mm screw may be ideal. i used nyloc but not required.
the bolt i used for the dial gauge is a m5 x 16mm. i used m5 nut.