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Here’s something that many don’t think about when converting a ’65 Mustang over to Pony interior. Since you’re losing the “Falcon” cluster when you upgrade to the five-dial cluster used in the ’65 GT and in all ’66 Mustangs, you’re upgrading from an oil light to an actual gauge. This means you need to change the sending unit from the small “idiot light” style to the large diaphragm model, and to do this you need this oil pressure sending unit extension to space the larger sending unit away from the block.