Do you have a mill and a lathe running DRO, but your have only one digital readout box? You can purchase a second DRO box, with a power supply, and attach it to your second machine, so you won’t have to switch it out and reset your input readings.
As long as we were designing the electronics package, we went the extra step to include an RPM readout, adding an additional function to the package. The sensors are easy to install and require no modification of your Sherline machine.
Always wear safety glasses when operating machine tools.