After learning that my oil control does not have a C terminal I was recommended to buy a transformer to be able to create a C wire for my WiFi thermostat. I have 5 wires going from my furnace to my thermostat (only the two are used). I have an older two wire heating system (R, W). Thanks to all for everyone's help and I hope this post can help someone in the future. I had a initial scare where it did not function but I interchanged the two AC connections and ensured all the wire nut connections were secure and it functioned quickly after. Using the diagrams provided by the Amazon reviewer "GK" and JPhi1618's diagrams below I was able to successfully install a Nest Thermostat on a two wire heat only system. I bought this ( ) AC Transformer and relay. If you have a 2 wire system you might likely need a relay. Wanted to finally say this is SOLVED with help from (see conversation below). Continuation from Can I use any of my existing oil control terminals (TTFFAA) for a C wire?
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