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

Product ID: 258260817

Details

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

⚡DC 8-15V power range

💡0.56" bright green LED display

🔄5-9999 RPM measurement range

€ 43.22

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Description

⚙️ Stay ahead of the RPM game with precision and style!

PRECISION RPM TRACKING - Accurate ±2-3 RPM readings for motors up to 9999 RPM, ensuring flawless performance monitoring.
PLUG PLAY HALL SENSOR - Includes a reliable Hall NPN proximity sensor with 1-5mm detection range for seamless integration.
COMPACT DURABLE DESIGN - Sleek 72x36x20mm tachometer with robust PLA and PE materials built to withstand 0-50°C operating temps.
VERSATILE INDUSTRIAL USE - Perfect for CNC machines, lathes, mowers, and springs—engineered for professional-grade applications.
VIBRANT GREEN LED DISPLAY - Clear 0.56-inch LED readout that updates every 0.06-0.5 seconds for real-time speed insights.

The DIGITEN 4 Digital Green LED Tachometer is a high-precision RPM speed meter featuring a wide 5-9999 RPM measurement range powered by DC 8-15V. It includes a Hall NPN proximity sensor with a 1-5mm detection range and a bright 0.56-inch green LED display for instant, clear readings. Designed for professional use in CNC, lathe, and mower applications, its compact and durable build ensures reliable performance in demanding environments.

Specifications

ASIN	B01FQMI18Y
Brand Name	DIGITEN
Customer Reviews	4.3 4.3 out of 5 stars (662)
Item Dimensions	7.1 x 2 x 3.6 centimeters
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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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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€ 43.22

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

View all Trustpilot reviews