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Fit a Smiths Flight speedo, then you can calibrate it to whatever you want. Mind you, costs roughly £200 so not a cheap option!
I've got used to using the tacho, 1500rpm in 4th is 30mph, 2600 in OD is 70mph etc. made nice and easy as 1000rpm is 20mph in 4th (approx and Sprint).
I have to get a Smiths electronic speedo for the Dolomega as it has an electric drive on the trans which interacts with the trans and trip computer too. So I MUST keep it! Merlin Motorsport at Castle Coombe do them for around £170, at least I don't need to buy the pickup which is another £50! But even so, i'm delaying the inevitable in the vain hope of finding a used one for more sensible money! I certainly wouldn't buy another for the Carledo whose Omega manual box came without any drive at all (manual Omegas draw a signal from the ABS) fortunately for me, the holes were all present, just blanked off and I installed the Carlton drive and driven gears with a Nova cable and speedo. I think this mismatch is what gave me the huge error, since the Carlton drive takeoff is from the gearbox output shaft, ie ahead of the final drive, and the Nova is driven from (effectively) the o/s driveshaft, ie the OTHER side of the diff! Using the Dolomite instruments could well make the speedo much more nearly correct! It would be cheaper to get a Sprint speedo recalibrated than buy another electronic one!
Steve