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If you have access to a ohm meter or multi-meter you could check the resistance of the "sending unit" . Connect one lead of the meter to ground and the other to the connection on the sender. Set the meter to measure resistance less than 1000 ohms and check. Cold I would expect you to see less than 500 ohms. At operating temp you should see around 200 Ohms. (I'm sure someone will have the exact specs). If the meter indicates an open circuit (greater than 1000 ohms) for either test it would be my guess that they gave you a switch. It may be called a "sender" but be a sender for a warning light (switch)
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