I've been ogling your meter project since it appeared on the MAKE blog. Great job! It's too bad that meters like those are so hard to come by; did you just hunt them down through ebay or something? From your text and photos, it looks like they are a mix of 0 - 3 volt and 0 - 1 volt DC meters. Are you just sending the PWM signal through a voltage divider on each meter?
PS: you can still use the AC meter, you'll just have to adjust for the slight voltage difference after the (presumably) built in rectifier.