I have a Red T furnace I'm not sure the model, but the code light flashes four times. A sticker on it tells me that a regulator switch is the problem. I located the switches with the help of the wiring diagram. My question is, can I replace these switches myself and where can I get them if so?

Natural gas, propane, electric, or oil burner? I only work on natural gas and propane Coleman/Red T units, and have never heard of a regulator switch, so Im assuming this may be an oil fired unit? If it is indeed gas or propane, let me know and we will get together on terms.