[InterceptPoint]

Aren’t the toy cars in the 47-49MHz range? That’s hardly line of sight like 1.2Ghz.
++++++++++++
If so, you are correct. No line of sight requirement. In any case the triggering mechanism would need an external antenna and a feed - through capable of holding the pressure. That can be done, of course, but you need to know what you are doing. Could be the plans they were following make provision for that.

[JRandomFreeper]

I just pulled out my pressure cooker and a piece of 26 ga magnet wire (varnish insulation) and put it between the lid and the pot under the rubber gasket, and it sealed right up.

No short between the metal pot and wire. I put a meter on it to measure it.

I only took it to 30 PSI with the air compressor through the vent.

I should can some tamales while I've got the pressure cooker out, and get rid of the pork in the fridge.

/johnny