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 DIGITEN’s precision pulse!

PLUG PLAY POWER - Operates on a flexible 8-15V DC power range, fitting effortlessly into your existing setup.
HALL SENSOR INCLUDED - Comes with a reliable Hall proximity sensor and magnet for precise, contactless RPM detection.
COMPACT LIGHTWEIGHT - Sleek 7.11 x 2.03 x 3.56 cm design weighing just 99g—engineered for space-conscious professionals.
PRECISION RPM TRACKING - Accurately measures motor speeds from 5 to 9999 RPM for ultimate control.
UNIVERSAL COMPATIBILITY - Works seamlessly with lathes, CNC machines, mowers, and more—your all-in-one RPM solution.

The DIGITEN 4 Digital Green LED Tachometer is a compact, high-precision RPM speed meter featuring a wide measurement range of 5-9999 RPM. Powered by DC 8-15V, it includes a Hall proximity sensor and magnet for accurate, contactless speed detection. Its bright 0.56" red LED display ensures clear readings, making it ideal for lathes, CNC machines, mowers, and other motor-driven equipment.

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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
Voltage	12 Volts
Item Weight	99 g

DIGITEN4 Digital Green LED Tachometer RPM Speed Meter+Hall Proximity Switch Sensor NPN

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