I have been contacted by a few members regarding the needle not truing on the guage after the install. I don't recall who you are, but your comments and solutions would be apprecaited by a couple other members. I was able to reseat mine to achieve the desired results. Please post...?
If you have the problem of the tach not reading 'True' to 0 rpm(s) when off: It's an Easy fix, you can Over direct it and when I removed it it was obvious what had happened. you don't have to remove the needle just move it all the other way until it comes to it's end then over direct it until it compensates for the other side being low, that's it!