I bought a used set of gauges that looked "nice enough" online, and was promised by the seller that they functioned correctly. Well it's true for the speedo but not the tach. It's frustrating when you buy something on trust and are disappointed, isn't it? I mean, in our generally honest community, this sort of thing USUALLY works out fine.
Anyway, water under the bridge... they weren't very expensive.
So while looking for a replacement, I found these.
I liked the look of these gauges -- they are 3.5"/80mm in diameter.
Note:
If you get these make sure you get the proper ratio for your tach. That have 4:1 and 5:1.
They don't come with brackets and the gauge mounting holes on my stock CB550k bracket are in the wrong places.
Also, these don't come with a provision for the oil pressure warning light, so I am fabricating a place for the warning bulb into the bracket I've made out of 1/16th aluminum.
I'll let you know if they work... ;-)
(i hope they do because I spent a few hours making this lovely polished bracket for them by hand.).