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I had to replace mine cause it broke. Found replacements here and ordered 2 of them. This is for the nail head sender. Yours could be different. They might have the other types also.http://www.repairconnector.com/products/GM-Single-Wire-Coolant-Temperature-Sender-Connector.html
if you dont care about the OEM look you can get away with a female spade connector that you would find in the hardware store