Is easel going to change my acme rod settings?

my machine was build with a 4 start acme rod on z axis according to the grble wiki $102 should be 47.244094 microstep/mm. since the only options in for acme or threaded rod will this default grbl to the 188.976 for a 2 start acme?

Yes, unfortunately. You’d have to set $102 manually in Universal Gcode Sender after completing the walkthrough.

right but i have to close easel to connect with ugs… right?

Yes. But Easel won’t change your settings during normal carving, only if you go through the setup walkthrough