How to setup probe on Mesa 7i96

Some of the probes (like the one I have) are active low. Generally the  7i96s is wired active high but you can choose to change that.
Also, my probe can handle up to 24 volts.
Sharing a link could be helpful.

Use "show hal configuration" from the "machine" menu to monitor the pin the probe is attached to.

I am using a momentary push button switch for the probe hooked up to +5vdc. The screw on the pin where the probe is attached shows 5 volts. What link are you referring to share. Hal does not show the pin on or off. The board is not seeing the probe. The pin would show up in some of that debounce stuff I was trying yesterday. On my config file on Tab 3 pin 1 I show probe in.

Where is the input common(TB3 pin 12) connected?

I don't see a 12 pin. Inputs go from 000 to 010. Everything else is output.

I don't see a 12 pin. Inputs go from 000 to 010. (You might get this twice. I thought I had sent it but it didn't show up.)