Hi Mike, yeah I get where you're coming from. I've a similar problem with the speedo. I've calibrated it based on the trigger wheel in the diff, diff ratio plus wheel circumference but have no way to prove if it is correct. The difference there is if it under/over reads, you can easily and accurately adjust on the fly.
I'll have to keep thinking where I can take it to test. Trouble is, where I live, most open spaces are taken up with sheep, cows or heather. Large empty car parks are not easy to come by.
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