spindle speed light only flashes when M3 or 4 is coded. Not a S code,
<
Geckodrive, 4 axes stepper motor system is used
VFD top row, left to right: V1 red, to 5 on gecko V2 blue to 6 on G dr, com, black, to 7 on G Dr
<
VFD bottom row. com , black to power supply Grd. AN1 is green to 9 on G Dr. 12V Red to 9 on G dr.
<On Gecko Dr, is gray to stepper switch 11 is Red to Power S . 12 IS Black to power s.
Hope this helps