When I looked into this, it appeared the best solution was a vortex street flowmeter. Here's DDG:
Quote:
https://www.sike-flowmeter.com › vortex-flowmeter_p0013.html
LUGB type vortex flowmeter is according to the principle of Carmen (Karman vortex street measuring gas, steam or the volume of liquid flow, the volume of the standard condition or volume flow to mass flow meter. And can be used as flow transducer is applied to automatic control system.V ortex flowmeter can be divided according to function name ...
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Vortex Flow Meters | Badger Meter
https://www.badgermeter.com › products › meters › vortex-flow-meters › ?bu=industrial
Vortex flow meters are suitable for measuring steam, as well as a variety of liquids and gases. High Levels of Sensitivity. Superior Performance at Low Flow Rates. Vortex flow meters offer many benefits in flow measurement applications, including simple installation and a wide turndown range. Advanced Sensitivity.
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With a Beetle having a gas gauge
if you're lucky and a speedometer driven by an undersized left front tire, I use two clicks on the pump and Google Maps.