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Did they change the speedo from 10/11-12 Wide Glide Models
Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
from what i understand u can not put a 2012 in a 11/10 because they are two completly different sizes. i could be wrong but i thought that i read that somewhere.
Same size 4". You can't use it on older bikes because they changed to a CAN bus system on the 2012 bike.
Street Bob, Wide Glide, and Sporty all have 4" gauge. Super Glide, and Fat Bob have a 5". Not sure of the size on the Switch Back. If I had a 5" gauge on my bike I'd have a speedo/tach combo already.