Hi guys... hmm the tacho on my seven is going crazy ... like its not giving me the good rev RPM and sometimes it just goes up and down for a sec or two... so the question is how am I supposed to fix that issue?

let me know thank you

 

Check your coil.

 

haha FD newb here.... where is that "coil"?

 

May actually be the tach itself, fairly common problem.

http://www.wrex-racing.com/docs/fd/Tach_Repair.pdf