Surprisingly it's a very light gauge cluster. When I first got it out my reaction was " holy shit batman!!" I added a very "tight" zip tie on the bottom sticky pad thing for added safety and now there's no vibration at all. Reads perfect!Ingenious repurposing!
Hope the speedo doesn't go flying. Not to be a downer, but I'm not sure the mount is cut out for the weight & vibration combination.
That's the spirit though!
Try using lock tight on threads first.or maybe straight ol PL and it will never come loose!