Guys still trying to get my head around what I have got and what I have not. - Mach diagnostics do not show an active encoder light.
The speed is apparently being displayed, but checking with optical tacho, 200rpm set and 208rpm actual given on Mach3 screen read out on the tacho at 240. So not too accurate.
I guess I will buy a new encoder head and make a Mach3 single slot disk to run on the back of the spindle.
Any suggestions for a UK encoder purchase appreciated.