I have a 94 Regal that is showing low voltage on the instrument panel gauge. When I check at the battery while running I have about 14vdc. I can't find a wiring diagram that shows where the gauge is tapped off. Thanks

This is a common issue on these cars, and is a problem with the instrument cluster since a reading of 14V is fine. You may also get a low fuel and/or check guages light also, caused by the same cluster issue.