for the Hunter machine. You can install an lcd 2004 controlled by an arduino nano. Do not need the cables anymore for input voltage. Just need an acid battery either 6v 4.5AH or 6v 1.3AH or 12v, there are many available. with these it can be portable. Take any of the heads to an electronic technician to find out the input voltage. figure out the output voltage when measuring camber or caster then use this to program the arduino with a voltage sensor would be easy. You can send the signal through a bluetooth device connected to arduino. make an app using appinventor display the values on a screen using chromecast. I did the same with a FAIP wheel alignment machine but used an accelerometer for camber and caster

Looks like you've got a gem there. Good luck with it, hope it works 👍

Nice video !

Just discovered your channel. And I like it. Very interesting bit of kit you got there .:-)