How to set TeeJet Flowback Valves & 744 control

[@dalewilliamson3355]

What is the part number of the exact regulating valve shown here?

[@tomhall1194]

We are using a TeeJet 744A-3 Controller on a trailer mounted sprayer. We want to use various pick-up trucks to spray ditches for weed control. Wiring the controller Red/Black to a cigarette lighter but what is the blue wire for? Must it be connected to a power source? Does the power source have to be the headlight switch as recommended for use with a tractor?

[@Newtoncrouch]

Blue wire is for backlight in the pressure gauge. You do not have to connect the blue wire unless you use the pressure component in low light. I hope this answers your question.

[@tomhall1194]

@@NewtoncrouchThank you for your reply. Yes it does answer my question.