I was pleasantly surprised by the gears fitting and working exactly as advertised on my 1982 300sd Mercedes. Very nice product. The online video helped a lot. All the clicking, jumping and slipping on my odometer are gone. I've been living with this broken odometer for ten years. I fixed it for $18. Professional speedometer repair for VDO speedos costs 10x that.
I'm very happy with my purchase.
White Electrical 12V 52mm 0-6000RPM Tachometer Gauge For Diesel Motor Engine
08. Mär. 2021
Know what you’re buying
So I’ll start by saying this works well. But...I had to take it apart and modify the internal circuit board to get it to work. The listing says works with “oxygen sensor” which is ridiculous. I assumed it meant crank sensor since this is a diesel tach with and there’s no spark on a diesel. When I got the item the instructions said connect it to my alternator. Unfortunately my application doesn’t have an alternator. I needed a readout for a crank sensor. I opened the thing up and found half a dozen solder jumpers to make it work with a variety of different inputs. Unfortunately some of the chips were unpopulated and I couldn’t get it to work for a TTL 5v square wave. So I finally figured out I could just run a wire from the green input wire directly to pin 1 on the big microcontroller in the middle of the circuit boards. And it works! Thank you Chinese engineers you are great.