I kept the chinese DRO scales and readout display from the previous mill. All of the travels were able to accommodate the travels on the new machine. Having a DRO is something I don't think I could now live without.
Here are some photos showing what I did:
I removed the scale and the stop post that was attached to the front of the table and used the t-nuts that where in the t-slot at the front of the table to attach the X-axis scale. I used some lightweight aluminium angle to protect the scale from chips and coolant etc. The cable was put inside plastic sheathing and was tied down with cable ties.
The Y-axis scale was attached to a plate that was attached in turn to the Y-axis stops bracket via standoffs. I used stand offs to clear the oiler for the knee dovetail. I replaced the steel stop piece with a new part that acts as both a stop and a bracket for moving the scale.
All the cabling was neatly routed and tied down with cable ties.