Tooth module: 2~6. Hope it is OK for you. Protection rank: IP67.
eBay
1PC Diesel Saver Engine Carbon Deposit Save Diesel Increase Power 120ml Diesel Fuel Additive Injector Cleaner
Aliexpress UK
Rev Counter tachometer for diesel engine mechanical/cable drive boat barge retro. Dispatched with Royal Mail 1st Class.
eBay
Inductive Tachometer Gauge Engine Hour Meter Alert RPM Backlit Resettable Tacho Hour Meters for Motorcycle ATV Lawn Mower HM032B
Aliexpress UK
Display range: 0–6000 rpm (on the dashboard). Internal diesel gauge. Suitable:For diesel engine. -Bright white LED lighting for night driving. Material: plastic. -The watch with black front panel and clear lens.
eBay
Inductive Tachometer Gauge Alert RPM Engine Hour Meter Backlit Resettable Tacho Hour Meters for Motorcycle ATV Lawn Mower HM032B
Aliexpress UK
Sensor size: M18 1.5. Tooth module: 2~6.
eBay
Digital RPM Measurement Hour Meter Small Engine Tachometer Monitoring Engine Hours for Ultralight Aircraft Chainsaw Motorcycle
Aliexpress UK
(4)Disconnect Switch Cable, the LED will still stay Green and calculate the detected pulse from engine. For example, if the input frequency is 100Hz @1000RPM, the sensor will convert the signal and then output 66.6Hz @1000RPM.
eBay
Car Lcd Engine Counter Moto Tachometer Hour Meter Rpm Waterproof for All 2 4 Stroke Gasoline Engine Motorcycle Chainsaws Marine
Aliexpress UK
Display range: 0–6000 rpm (on the dashboard). Internal diesel gauge. Suitable:For diesel engine. -Bright white LED lighting for night driving. Material: plastic. -The watch with black front panel and clear lens.
eBay
Small Engine Tachometer RPM Measurement Digital Hour Meter Monitoring Engine Hours for Ultralight Aircraft Chainsaw Motorcycle
Aliexpress UK
Specs - 1/4" Transducer. Requires 12-24 VDC vehicle power. Refer to images 2 & 3 for more information. Design Technology Inc. Fits/For most diesel engines. Can be mounted easily using two mounting tabs or double sided tape.
eBay
RPM Measurement Small Engine Tachometer Digital Hour Meter Monitoring Engine Hours for Ultralight Aircraft Chainsaw Motorcycle
Aliexpress UK
(4)Disconnect Switch Cable, the LED will still stay Green and calculate the detected pulse from engine. For example, if the input frequency is 100Hz @1000RPM, the sensor will convert the signal and then output 66.6Hz @1000RPM.
eBay
Waterproof LCD Digital Engine Tach Hour Meter Tachometer Gauge Inductive Display For Motorcycle Motor Stroke Engine Marine Car
Aliexpress UK