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Your FAN/LIMIT control is your limit switch. So you should be able to wire up the new GeniSys ignition control.
It should be pretty simple. What wires are currently connected to your existing burner?
Since I don't know specifically what you have I would think your burner currently has a 120v hot and neutral and the thermostat is connected to the ignition control?
If you aren't sure how about a picture of the burner showing me the wiring. You can post a pic here by clicking on ADD FILES next to the SEND button