Dial indicator: https://www.amazon.ca/dp/B07HFV25M9?psc=1&ref=ppx_yo2ov_dt_b_product_details
3D printed holder from PLA: see attached file.
Screw: 1/4-20x1.0in to fix indicator on the holder.
To fix the indicator on the printer I have using same screws that fixes the print head.