Pods8, what do you mean by "bypass switch" my thermostat does the exact same thing yours does and having to take it off and wear it in your pocket for a few minutes is hokey. I like the sounds of your mod but don't understand it. Thanks.
All the thermostat is doing is closing a switch and making a connection for the two wires that are connected to it. I added a manual switch as well in parallel to the thermostat (from each of the two wires going to the thermostat there is now a branch at the end of the wire, one leg to the thermostat and one to the switch). Either of them closing will fire up the furnace.
Stepping back: Your furnace has 3 wires. Positive, negative, and thermostat. The first two should be obvious how they are wired up. The thermostat input just needs a positive connection applied to it to fire up the furnace, so there is a positive wire that goes from the power source through a thermostat and then to this furnace connection. The thermostat is just a switch that makes/breaks this connection to turn the furnace on/off.