If you want to measure rotation speed and with good accuracy, the ET-100 Engine Tachometer, with its pulse and analog output, can respond to this need.
Packed with all the capabilities of an engine tachometer, but can of course still be used as a tachometer for general FV conversion.

Conveniently built-in functions for engine revolution measuring
Apart from the ignition pulse detector (sold separately by our company), it is also compatible with various other sensors including gear sensors, proximity sensors, and photoelectric sensors.
Built-in high-speed response for F/V conversion output, pulse output, and USB output