How to Transmit Two 4-20mA Signals Between Facilities Using Only 3 Wires?

I have 3 signal wires i can use to connect an outside and inside facility as show in the diagram. I want the PLS (PLC) to read the signal of the "TT" (Temperature transmitter) on the "inn" port, copy the signal, and resend the signal to the "Reg" (PID controller). The 2 signals are to be identical, i do not have any kind of 4-20mA signal splitter. I only have 3 wires i can use between the two facilities and have come up with a drawing that might work, my teacher doesent know if it will work either and i want to be sure it wont destroy any components. Would appreciate any help.

-Jonas