I have an 86 ZXT with the digital guages. Today they started going a bit crazy. My voltage meter shot all the way up over 16 and my temp gauge dropped all the way down to the bottom. They are moving together in perfect sync but in opposite directions. Occasionaly it will correct itself for a moment, the voltage will go to around 14 and the temp will rise to close to the middle but then they jump back to their one stuck up and one stuck down positions. All appears normal under the hood. Any ideas what could make this happen?