Just installed the Honda Amp Gauge by Bike MP3...have to say once again...outstanding customer service. I needed a push in the right direction, PM'ed Pete and he came to the rescue!!! Excellent product, I got the amp gauge with the cut out for an additional $17...but well worth it !!!
http://www.bikemp3.com/Panel-Mounted-Volt-Meter-For-GL1800-HGW-VLT-MTR.htm?categoryId=-1