Rev counter for our engine

I am surprised and concerned at how expensive some original parts for our boat engines can be.
My Yanmar 2GM20F engine did not come with a rev counter, a tachometer, and when I started looking for the original part, especially the engine sensor, I almost fell on my ass: 200 euros for the engine sensor and at least 100 more for the clock !!

A search on AliExpress helped me discover multiple options for 10 or 20 times less money… So I’ve decided to make this video showing you the different options for measuring and having a very cheap rev counter on your boat.

These are the different options that I have tried:

✅ Revolution laser meter:
🔵 On AliExpress: https://s.click.aliexpress.com/e/_986idT
🔵 On Amazon a little more expensive: https://amzn.to/3KFcvMj
✅ The application to measure them with the mobile:
🔵 On Android: https://play.google.com/store/apps/details?id=com.wenquan.strobelite
🔵 On iOS: https://apps.apple.com/cr/app/strobe-tachometer-rpm-meter/id831460940
✅ The one I’ve had these years, digital and very cheap:
🔵 On AliExpress: https://s.click.aliexpress.com/e/_A8PccB
🔵 On Amazon: https://amzn.to/3tcw1tL
🔵 Remember that you will need a magnet https://s.click.aliexpress.com/e/_9Jq3ER or https://amzn.to/3JagPCL
✅ The digital rounds:
🔵 Mine on AliExpress: https://s.click.aliexpress.com/e/_ArOitJ
🔵 Prettier and slightly larger alternatives: https://s.click.aliexpress.com/e/_9wnxgt
🔵 Some alternatives on Amazon:
🔸 Like mine https://amzn.to/35QD0PR or this option that seems the same and very cheap https://amzn.to/3KCKeFW , maybe too much.
🔸85mm with needles: https://amzn.to/3MKYUog
🔸 Needles and 52mm https://amzn.to/35QD0PR
✅ The engine sensor, choose properly for the size of the original, in my case, Yanmar, is the M18:
🔵 On AliExpress https://s.click.aliexpress.com/e/_ArOitJ
🔵 On Amazon M18 https://amzn.to/3KsuLs6
🔵 On Amazon M16 https://amzn.to/3vWCR8n