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The black wire is going to GND, the red wire is going to 3v3, and the white, yellow, green, and blue wire are going to 10 - 13 respectively. @ScruffR’s question about trying 3v3 on the Photon to VIN on the shield - where would the red wire go from the Shield to the RTD board then? Would I take the 3v3 pin on the shield to the VIN on the RTD? The RTD simulator has 4 connections so it is suitable for replacing 2-wire, 3-wire and 4-wire PT100 temperature sensors. The wiring can be connected to the screw terminals at the back side. The PT100 simulator is intended for panel mounting. PT100 RTD simulator operation. The TMT127/187 RTD temperature transmitter is a two-wire transmitter with an analog output and a three- or four-wire resistance thermometer input. The TMT128/188 TC temperature transmitter is a two-wire transmitter with an analog output and thermocouple input. PT100 sensor 4-20mA transmitter Digital Display (temperature) From the above circuit diagram, I see that the PT100 sensor will go in to terminals 7, 8, 9. The transmitter needs a 24vDC supply, and the digital display gets it signal from two wires from the transmitter.