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Most visible: The gas tank:

under the cap: Safety valves, liquid level meter:

under the hood: Main valve and vaporizer, taking heat from coolant:

limited air flow for propane operation (vaporizer is too small for full power):

Top of the mixer, inside the air filter:

Landi mixer in detail

..bolted on top of the carb, only using the carb's butterflies:

mixer seen from the bottom:

Switch under the dash:

Switch has three positions: regular, propane and no fuel. No fuel position is necessary to empty the carb before switching to propane. During propane operation, fuel is cut off from the carb. Four LEDs show the amount of gas left in the tank.