To further clarify for you rb199man the reason there are three banks on the flying flick knife are the sweepy wings. And that is why on the GR version the most readings are on the middle bank equating to 45 degrees of sweep, where most of the flying is done.
The guage as opposed to the meter on Albert is up front and having been fitted in the mid 60s and never serviced since is quite possibly wildly inaccurate. The meter shuts off at less than 150 knots so thats no good either
As far as I remeber having spent 18 years on Tornado there has never been anywhere to record the cockpit reading.
As for your Newton theory its the weight inside the instrument which drives the needles against a spring. Weight heaver than needles, so thats how it records positive.
I think apologies should be winging there way across the pond round about........now