PJ, these are mechanical gauges correct?? I have close to the same ones in my 1970 Nova. They are period correct and could be used in many different vehicles. The Shelbys did use this type of gauge as well..
As far as the temp. gauge I have the flexible mechanical line going to the drivers side head on the side. It connects/screws into this area where the original idiot light switch would have gone. Does your gauge have a sending unit on it now??? I know on mine I had them rebuilt by a guy on the east side of Cleveland, John Wolf, who is excellent when it comes to these things. He installed a new line on mine with the correct fittings. He also does lots of aviation stuff also. Here is is website:
www.antiqueinstrument.com
I would give him a call and inquire about the gauges... He should be able to help you with any questions you have..
Rich