545D Ford transmission question

[Deewight]

New to me - tractor has power reverser and also has a decal on the dash that says you can run the unit with the torque converter locked up and a corresponding light on the dash that would appear to come on if the torque converter is in lock up. Cannot find switch to lock up torque converter.
Can anybody help me out that this might be an option that I don't have or where is the switch??? TIA

 

[Deewight]

Sorry - I looked around the dash again tonight and finally found what I was looking for.