If you got them from Autometer, they should have come with a paper detailing the install/hook-up locations... if yours did not include this paper, Ill scan in what came with mine and post that up online for you
other then that, the voltometer should be relitivly easy install... I actualy hooked it to my cig lighter - prolly not the best place, but atleast it works and it's acurate - then shuts off when the key isnt in the ignition.
as for the A/F Gauge... Ill search for some details online and pass down the links that i find