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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4 Digital Green LED Tachometer RPM Speed Meter + Hall Proximity Switch Magnet Sensor NPN for Lathe Conveyor Belt

Product ID: 28592239

Details

Brand
DIGITEN
Item Weight
3.5 ounces
Item dimensions L x W x H
2.8 x 0.8 x
Material
Number of Items
1

⚡5-9999 RPM range

💡0.56" bright green LED display

🧲Hall proximity sensor with 2-3mm detection

29433CFA

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Description

🚀 Measure Every Revolution, Master Every Move!

PRECISION RPM TRACKING - Accurately measures speeds from 5 to 9999 RPM with ±2-3% accuracy, ensuring flawless motor performance monitoring.
VIBRANT GREEN LED DISPLAY - Features a crisp 0.56-inch green LED for instant, easy-to-read RPM data even in dim industrial settings.
PLUG AND PLAY INSTALLATION - Compact M12 sensor and panel cutout design (68x33mm) allow quick setup, minimizing downtime and maximizing productivity.
WIDE VOLTAGE COMPATIBILITY - Operates efficiently on DC 8-15V, making it adaptable for various industrial machines like lathes, conveyors, and CNC equipment.
SMART HALL PROXIMITY SENSOR - Includes a reliable NPN Hall sensor and magnet combo with a 2-3mm detection range for seamless, contactless RPM measurement.

The DIGITEN 4-Digit Green LED Tachometer is a high-precision RPM speed meter designed for industrial applications such as lathes, conveyors, and CNC machines. It features a wide measurement range of 5-9999 RPM, a bright 0.56-inch green LED display, and a Hall proximity sensor with a 2-3mm detection range. Powered by DC 8-15V, this compact and easy-to-install device ensures accurate, real-time RPM monitoring with ±2-3% accuracy, making it an essential tool for professionals demanding reliable motor speed data.

Specifications

ASIN	B01FQMI18Y
Best Sellers Rank	#31,731 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #9 in Industrial Tachometers
Brand Name	DIGITEN
Customer Reviews	4.4 4.4 out of 5 stars (725)
Item Dimensions	2.8 x 0.8 x 1.4 inches
Item Weight	3.5 ounces
Manufacturer	DIGITEN
Material Type	PLA_(Polylactic_Acid), PE_(Polyethylene)
Model	5823950920
Number of Items	1
Part Number	RPM1204GHA
Unit Count	1 Count
Voltage	12 volts

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