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

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

Product ID: 234891026

Details

Brand
DIGITEN
Item Weight
3.5 Ounces
Item dimensions L x W x H
7.1 x 2 x 3.6
Material
Plastic
Number of Items
1

⚡DC 8-15V power range

📏0.56" green LED display

🔄5-9999 RPM measurement range

R1360

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Description

🚀 Elevate your machine’s IQ with precision RPM insights!

PRECISION RPM TRACKING - Accurate ±2-3 RPM readings for flawless motor monitoring
INSTANT VISUAL FEEDBACK - Bright 0.56" green LED display ensures clear, real-time RPM data
PLUG PLAY INSTALLATION - Compact design with easy panel cutout (68x33mm) for quick integration
WIDE VOLTAGE COMPATIBILITY - Operates seamlessly between 8 to 15 volts DC for versatile setups
ROBUST HALL PROXIMITY SENSOR - Includes M12 sensor with 10mm detection range for reliable pulse capture

The DIGITEN 4 Digital Green LED Tachometer is a compact, high-precision RPM speed meter designed for professional use in CNC machines, lathes, mowers, and more. Powered by DC 8-15V, it measures speeds from 5 to 9999 RPM with ±2-3 accuracy, displaying results on a bright 0.56" green LED. Equipped with a reliable M12 Hall proximity sensor and magnet, it offers quick, clear RPM readings and easy installation, making it an essential tool for millennial managers seeking precise motor performance data and seamless integration.

Specifications

ASIN	B01FQMI18Y
Best Sellers Rank	#75,533 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #93 in Motion, Speed & Force
Brand	DIGITEN
Brand Name	DIGITEN
Customer Reviews	4.3 out of 5 stars 653 Reviews
Item Dimensions	7.1 x 2 x 3.6 Centimeters
Item Weight	3.5 Ounces
Item dimensions L x W x H	7.1 x 2 x 3.6 Centimeters
Manufacturer	DIGITEN
Material	Plastic
Material Type	Plastic
Model Number	5823950920
Part Number	RPM1204GHA
Voltage	12 Volts

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