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John was doing this
www.youtube.com/@Gnipsel/videos
See last 3 videos.

As a Canadian, I’ve always preferred buying from MesaUS. They typically use USPS/Canada Post for shipping, which is far more affordable than other carriers. However, today I did a quick search for their website and didn’t get any results. I'm unsure whether the site is temporarily down or if Mesa US has shut down operations altogether. John, the owner, has been an active and helpful member of this forum—hopefully he’ll chime in soon and clarify what's going on.
I don;t use step/dir cards in my projects but the 7i96 seems to be the most popular card for step/dir projects.

Hello, I started to modify the file, go to the ini file, but I don't know how to assign the float switch to pin 02.

[codeemc/iotask/ioControl.cc 786: can't load tool table.
Starting HAL User Interface program: halui
linuxcnc TPMOD=tpmod HOMEMOD=homemod EMCMOT=motmod
twopass:invoked with <> options
twopass:found ./UDP2.hal
twopass:found ./custom.hal
twopass: Error in file ./UDP2.hal:
    Pin 'float-switch.debounce.in' does not exist
Shutting down and cleaning up LinuxCNC...
Running HAL shutdown script
Removing HAL_LIB, RTAPI, and Real Time OS modules
Removing NML shared memory segments

Debug file information:
Note: Using POSIX realtime
2484
Stopping realtime threads
Unloading hal components
Note: Using POSIX realtime][/code]

My understanding, you would like to add a hardware  estop and  potentiometer to set feed override to your Mesa 7i95.
Since I have never configured a 7i95 I used Microsoft AI Copilot to generate add ons to hal and ini. see attached.

A quick scan of the 7i95 manual  did not show any reference to an analog input, you may need to open a new discussion in the board interface section of the forum and see if there is a custom file that can convert one of  7i95 pwm pins to accept 5v analog input.

Note if you encounter errors when testing  ask copilot for help, it seems to be well trained  with linuxcnc configuration.