I bought a Shooting Star (Canadian) three axis readout for a mill many years ago. Put it on the lathe. The third (z) axis went on the tailstock. The advantage to SS was that it used a rack and pinion drive, not glass scales. Easy to shorten, easy to custom mount. Used phone connectors to the heads. 3.5 digit readout (XXX and 0 or 5) plenty good enough. Big LED readout. If you don't have X & Y readouts, get a DRO made for a mill, not a lathe- the third axis is cheap and the DRO really makes life easier. Glass scales may be easier to adapt now, don't know- but make sure whatever you get can be mounted/shortened if needed, and think hard about LED vs LCD displays vis-a-vis readability in your shop lighting.