I have found a number of these VDO speedometers that were a rupp option. With these wheels and the drive that came with the speedo it it very close to my phone GPS. Problem is if you use different diameter wheels like 10" or 12" rim sizes it will read way low.
An app on your phone and a phone holder not in the option list? GPS is what I use, the Speedometer app. There are also race apps that track 1/4 mile time.
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