Since your car isn't going anywhere anyway, it may be worth your time to find the sendor.
The stock location is on the swirl tank. This is not such a great idea. If you spring a leak or split a hose, you will be measuring air temperature, will will most likely be a whole lot cooler than your poor, suffering, overheating engine. You don't care what the temperature is in the swirl tank - you care what the temperature is in your block!
Leave the sender right where it is (if it isn't leaking you don't want to take it out) and buy a new one. Make sure you buy one for a Cleveland and make sure it is for a temp gauge and not an idiot light. There is a place designed for it in the block just above the water pump.
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