How to:gas solenoid valve

[Superbad]

hello all,
either I can't see the wood for the trees,or there isn't a topic already on the forum about a photo guided installation of a solenoid valve. This is on my sip migmate 150,and the valve was already partially installed. The original gun had the brass valve inside itself. Now,I'm installing a Parweld replacement gun.
Two black wires go to this plate

But this is where I get stuck. So,if someone could kindly let me know what wire goes on the yellow arrowed terminal?

As you can see on the other terminals,the two blacks that lead to the plate in the first photo.
I do have two wires coming from the Parweld gun,blue and brown. The blue wire,I assume should be joined up with the blue from the PCB connector as it was on the previous gun?

The wire on the right is T'eed off from the thick black cable that gets fastened to the gun lining end,ground wire?

thanks in advance

 

[Robotstar5]

The 3rd terminal on the solenoid is sometimes used for an earth connection, not required inside your welder.

 

[shenion]

If there was only one wire on the old gun, then the other wire from the new onw would go to the torch power lead.

 

[Superbad]

Thankyou gentlemen,I shall take on board your advise

 

[Superbad]

Excellent,thanks again. Got it working yesterday,I just connected the blue wire from the gun to the blue wire from the pcb,and the brown wire from the gun the T-off from the thick black wire. I did have this gun connected up to my migmate 130 several years back before the welder caught fire.
I hope this topic serves use to others