Caboose,
I havent seen one that flashes, yet I know that glowshift has one that wanr you by audible tones. The link is
www.glowshiftdirect.com
I stand corrected...straight form the horses mouth..."If you wish to be alerted when you reach a critical level, the Elite series allows you to program your own high and low warning points and it will alert you visually and/or audibly."
-Smurf-