Morning guys,I have a lathe that came with a rotary phase converter which I will be able to run other machines with it so that a plus.My problem now is telling how fast my lathe is running since it has the reeves pulley setup,which I use a crank handle to change speeds.So last night I got on Youtube and watch some that those owners installed a tach on their lathe for rpm reference.What I am wondering if someone here has done that to their lathe or mill would like to hear how you like that setup?Or if you solve this problem dealing with it another way please let me know cause I don't have a clue.Either way,where or who did you purchase your parts from,I did look at the auction site and there must be a million tachs.How can a person tell which one is better than the other