This is "a down and dirty" edited version of the 1024_RPM.set from this post: https://www.machsupport.com/forum/index.php?topic=21899.0 which is an update of 1024.set included with Mach3. I've added two additional user DROs to display VFD frequency and VFD amperage from the http://royaumedeole.fr/informatique/plugin-mach3-pour-vfdhuanyang/mach3-plugin-for-huanyang-vfd/ (Le royaume d'éole)

Configure the RPM display by selecting the dropdown for RPM then enable the user DRO by setting it to 2222
Configure the frequency display by selecting the dropdown for frequency then enable the user DRO by setting it to 2223
Configure the amperage display by selecting the dropdown for amps then enable the user DRO display by setting it to 2224