I haven't talked to the guys at Bosch in a little while, but my guess is that they stopped using the SUN logo because either they didn't want to or weren't able to renew the license agreement with Snap-on. SPX made the tachs and had the license agreement with Snap-on in place for years (originally granted to Actron which SPX bought in the early 2000's), the license agreement went a few more years after it transferred with the sale to Bosch.