hello fellow scootriders. ive been trying to install an after market tach for a few days now and can not get thing to work. ive connected the signal wire to the data wire in the speedo connector. and ran power wire and ground. now the tach will swing from 0 too 8000 then back to 0 again then it just jumps up and down from 0 to 1000 . what i did to test tach was coil a copper wire around the spark plug wire 5 or 6 turns and connect the signal wire from the tach to that and it works just fine. how do i get this working right. im at the end of my wire lol.