can you run the wires for power directly to the power switch on my wood lathe?

Hello; The requirement for the 4-digit counter is a DC voltage between 8 and 15 VDC. Your switch, I presume, switches 120VAC to the lathe if you live in the U.S., and 240VAC if you live in Europe, England, or a few other countries. It would make for a nice fireworks display if you connected this device to a higher AC voltage. What I did was to buy a small 120VAC to 12VDC low current power supply, and it was about the size of a small box of matches, perhaps an inch (25mm) on the longest side. The power supply and display come on with the switch, and report on my lathe's RPM just nicely. I hope this helps, best of luck, Ken

what is the thread pitch of the Hall sensor threads

12 mm x 1 mm pitch. Kind of an oddball size. Hope this helps

Can I use a 3/16" or 1/4" dia. magnet that is longer, so I can drill a hole in a pulley, so it can't fly off?

Your probably better off with a drop of 2 part epoxy or super glue. By drilling the pulley and replacing with a different density material you may change the balance and induce vibration. I just let the magnet hold it on my wood lathe shaft so far to 1200rpm.

I have a vfd suppling power to a 3 phase motor, the vfd has a terminal with 10vdc output connection but only allows 10ma is that enough power to run

Enough power to light up a small LED but nothing else.

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🚀 Elevate your RPM game with precision and style!

RAPID REFRESH RATE - Updates RPM data every 0.06 to 0.5 seconds to keep you instantly informed
PRECISION RPM TRACKING - Accurate ±2 to ±3 RPM readings for flawless motor monitoring
COMPACT DURABLE DESIGN - Sleek M12 sensor and compact tachometer fit any workspace with ease
WIDE VOLTAGE COMPATIBILITY - Operates seamlessly between 8V and 15V DC for versatile setups
PLUG PLAY SENSOR INTEGRATION - Includes Hall NPN proximity sensor with easy wiring for quick installation

The DIGITEN 4 Digital Green LED Tachometer is a high-precision RPM speed meter featuring a wide measurement range of 5 to 9999 RPM, powered by a flexible 8-15V DC input. It boasts a bright 0.56-inch green LED display for clear readings, rapid refresh rates for real-time monitoring, and comes with a Hall NPN proximity sensor for easy, reliable installation. Ideal for CNC machines, lathes, mowers, and more, this compact and durable tool ensures professional-grade performance in any industrial or workshop environment.

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Manufacturer	DIGITEN
Brand	DIGITEN
Product Dimensions	7.11 x 2.03 x 3.56 cm; 99.22 g
Item model number	5823950920
Manufacturer Part Number	RPM1204GHA
Material	Plastic
Colour	Green
Voltage	12 Volts
Manufacturer	DIGITEN
Item Weight	99 g

DIGITEN 4 Digital Green LED Tachometer RPM Speed Meter+Hall Proximity Switch Sensor NPN

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