Actually 6 + 3 should be necessary to connect momentarily to start the control box, if the wiring is still original
It's a safety feature that depended on the barrel switch/ apron lever to be in the center off position before the machine would start from cold or an E-stop
We can try shorting 6 and 3 together permanently, but you might find a problem with the E-stop restarting the machine when you
let go of the button- check that out and let me know.
You need to test your barrel switch in all 3 positions and write down which terminal pairs connect, then we can hook it up
Does your meter have a beep mode? That makes it easier
Ignore any previous info I may have posted about the barrel switch- it's incorrect and was only a guess