it requires a temp sending unit, and a temp gauge, i dont understand the question.. is it a gauge that actually reads "diff temp" on the dial you are looking for? if not, then any temp gauge will do. but why do you want to know the temp in the rear end? you cant really do anything about it, and besides the rear, or the oil for that matter is designed to handle anything you can throw at it on a public street, including the german highway, where there is no speedlimit
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