Kenny, I posted the same question on several forums some time ago and got no response.
Here are the basic components (got these from Bruce at Aberdeen last year). In the image you'll see the ether canister, metering solenoid with the nozzle, 20F switch and a wiring piece. The switch is the same as the flame heater switch, only the tag is different as you mentioned.
In operation, holding the switch on triggers a 6cc shot of ether into the intake manifold adapter and it will only work when the temp is below 20F with the temp switch installed and while cranking the engine.
There is another wiring harness included also, which I guess disables the system when the engine is not turned over, but the basic operation is as described above.
PS. The background is the bed of the pipeline truck, now about 10 months old.