Is there a quick bench test for 280z gauges?

A friend on the west coast picked up a set of gauges out of a 2+2 280z, I believe a '78, and before sending them out to me, I was wondering if there is a quick way to test them (and thus make it worthwhile to ship). After searching the forum, I found that you can do a quick test on the oil pressure/voltage gauge by using a 9V battery (if the needles rise, they are most likely good), but I just wanted to ask before sending any potentially risky voltage through the other gauges.

Thanks in advance for any help on this!