[TR] HVDA 5-speed in TR6--speedo gear

[Hoyt Duff]

You could use an adapter like this:
http://www.a1speedometers.com/ratio-adapters.html . I'm sure there are
others such as those on eBay:
http://www.ebay.com/itm/Gear-Ratio-Adapter-to-speed-your-Speedometer-up-20-/132076508957

(There are also adapters that turn the mechanical into an electric output.)

I believe the industry standard for determining the ratio required is
the displayed speed at an actual 50 mph. So "display/actual".

-- 
Hoyt