Looks like they just threw any instrument they could find into it. I suspect that the original Russian books and instruments may have used km/h to keep things interesting (or am I confusing Russian and German cockpits here...?), so the Vne number may be from one translation of the Russian documents and the instrument is perhaps based on something else again. Indeed, not good practice, but registered as 'experimental' so more or less the owner/operator's problem...
