the speed of my sprocket maybe in excess of 4000 rpm, will the magnet hold on at this speed or should I glue it

Glue it close to shaft. Another option is use something like this: LJ12A3-4-Z/BX Metal Detecting NPN NO 3 Wire DC 6-36V This is an inductive sensor which doesn't need a magnet but you can pick up on a bolt head which is what I did for my disco so that I could tell which wheel had lost traction

How close does the magnet need to be to the sensor?

Their customer support replies promptly to queries. They said, in email to me, 2-3mm is best - with south pole pointing at sensor. The leaflet with unit and spec says 10mm.

Can this unit be used with a diesel engine

Depends what you want to measure? This unit's sensor can be placed next to any rotating equipment (as long as there is space for a bracket, with the magnet on the rotating part) and measures RPM only. Would connect directly to 12V DC supply of a car battery/alternator.

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

Product ID: 54700512

Details

Brand
DIGITEN
Item dimensions L x W x H
7.1 x 3.6 x 2
Item weight
2.12 Ounces
Material
Plastic
Number of items
2

⚡8-15V DC power range

🔴0.56" bright red LED display

⏱️5-9999 RPM measurement range

₩60706

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Description

🔴 Stay ahead of the RPM game—measure, monitor, master!

VIBRANT LED DISPLAY - Clear, bright 0.56" red LED ensures instant readability even in dim workshops.
PLUG PLAY HALL SENSOR - Includes reliable Hall NPN proximity sensor with 10mm detection range for seamless integration.
COMPACT DURABLE DESIGN - Sleek M12mm cylindrical sensor and compact tachometer fit perfectly into any industrial environment.
PRECISION RPM MONITORING - Accurately track machine speeds from 5 to 9999 RPM for ultimate control.
WIDE VOLTAGE COMPATIBILITY - Operates effortlessly on any 8-15V DC power supply—flexibility that fits your setup.

The DIGITEN 4 Digital LED Tachometer is a professional-grade RPM speed meter featuring a bright 0.56" red LED display and a Hall NPN proximity sensor. It measures speeds from 5 to 9999 RPM with high precision, powered by a flexible 8-15V DC supply. Designed for industrial tools like lathes, CNC machines, and woodwork, it offers quick refresh rates and a compact form factor, making it an essential upgrade for any serious workshop aiming to optimize machine performance.

Specifications

ASIN	B00VKAT8A2
Best Sellers Rank	80,186 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 37 in Industrial Tachometers
Brand	DIGITEN
Country Of Origin	China
Customer Reviews	4.2 4.2 out of 5 stars (433)
Item Dimensions	7.1 x 3.6 x 2 centimetres
Item Weight	2.12 Ounces
Manufacturer	DIGITEN
Manufacturer Part Number	RPM1204RHA
Material	PLA_(Polylactic_Acid), PE_(Polyethylene), Plastic
Model Number	5864173439
Number of Items	2
Number of Packs	1
UPC	785497558080 713458679192
Unit Count	1.0 count
Voltage	12 Volts

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₩60706

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered 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 South Korea.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Great experience from order to delivery. Highly recommended!

1 week ago

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The product quality is outstanding. Exactly what I needed for my work.

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