Review on 🔢 DIGITEN 4-Digit Green LED Tachometer with RPM Speed Meter and Hall Proximity Switch Magnet Sensor NPN, Ideal for Lathe and Conveyor Belt Applications by Ryan Turner

I bought this for my Craftsman lathe. The headstock speed chart is so faded I can't read it and I can't find a chart with the same belt arrangement as mine. I used the stopper pin hole on the headstock housing as a retainer after making the pin that replaced the pin. The entire installation took a few hours and all I bought was a couple of set screws and allen screws. I also bought a Revain 9 volt battery adapter canister with a switch to power it. The readings are housed in a plastic container with a weatherproof lid. I bought this from Dollar Tree, you guessed it, for a dollar. The schematic is simple and I used small wire nuts. Later I can solder the connections and seal them with shrink tubing. Once I found the spot where the magnet should be, I marked the socket, degreased the spot and reinstalled the magnet with the correct polarity, putting a large bead of superglue on the spot in case I accidentally moved the magnet. The next day it was very safe. I ran the lathe with no glue on the magnet and it doesn't move, but I decided to better secure it in case I reset it. I started the lathe and if my chart from one of the belt mechanisms I can read is right on the lathe it is within fifteen RPM of the chart. The diagram shows 685 and the number is 700. I'm not sure if the pulleys are original Craftsman, but I trust the numbers.