I run a temp gauge with 2 senders. One for the trans temp. One for engine oil temp. I use a switch to change back and forth. I also have fuel pressure , brake pressure(I foot brake) and a vacuum gauge (I run a pump). Ran out of room so the vacuum gauge is in the glove box. I don't need it every pas. I open the door if I need to check it. The volt gauge is a smaller 2" model mounted where the nitrous switch's were in the switch box. I also have a second voltmeter in the trunk by the battery.
Doug