Need a little help - Just got a chance today to install the BRP Tach. The rpm's jump from 500 to 2500 at idle and as you rev the rom's jump nearly 2k rpm back and forth. I have a hunterworks tri-fire cdi - could this be my issue? I did not have time to put the factory one in to try it.... I connected the tach as follows - red wire to switched ignition - black wire to chassis ground - green wire to orange wire in middle plug of cdi. Any thoughts ???