low volts, not charging '90 200

[Nick Lawrence]

'90 200 tqa,  while driving this morning my volts went very low.  On the analog guage, below the 12v mark, and 10+ - on the climate control read-out. 
 Measured volts with a Digital Fluke Meter at the cigarette lighter and at the battery read about 1v higher, almost 12v.
Revving the engine doesn't seem to produce charge.
Another obsevation, in the instrument cluster the water temp, oil temp and fule guage were reading noticibly lower than normal.  
My direction is to look at the alternator first.  Any other BTDT will be appreciated.
Nick   central Ohio