I did a quick search and it doesn't look like the sending units for a warning light type of setup is the same as a guage style. You can probably run both, but it would require some electrical know-how of the system for you to rig something up. Any Mustang vendor would sell the sending units for guages. I have attached a link to the oil sending unit from cjponyparts.com. I've had great experience with them in the past and they are always offering discounts and free shipping. You may also need the oil sending unit extension housing if you don't already have one. A search for the temp sending unit brought up two different sizes. You'll have to do a little more research to figure out which one is the correct one for your car.
If you're going with new Autometer guages, I'd recommend going with mechanical guages. They are usually more accurate. When you buy guages from Autometer they typically come with the correct sending unit. Good luck!
OIL SENDER SWITCH GAUGE STYLE 1965-1989 - CJ Pony Parts, Inc.
r/s
Chris
__________________
'66 Coupe 289 C4