sunpro tach come vpw mpg gauge:
Atmel AVR 2004 Design Contest
Also graphical displays exist of course:
http://ecomodder.com/forum/showthrea...html#post55308
Not sure how the 9100 will work on a diesel, you might have to do it yourself if you "want it done right"
I prefer the analog to the bar fwiw.
Also the standard mpguino LCDs can do a little bar graph thingie too with custom programming:
http://ecomodder.com/forum/showthrea...-etc-8695.html