Every once ina while, I see questions about bouncy or erratic tach needles. Sometimes but not always, this happens when an electronic ignition is added to a car with a factory tach. I ran into this recently when I added an MSD RTR distributor, it didn't like my oer in dash tach at all. I made up a lil fix courtesy of radio shack, and just thought I would put it up here in case anyone can benefit. The link below shows how to make one, or otherwise get one:
http://home.comcast.net/~Jimragtop/tachfilter/index.htm
http://home.comcast.net/~Jimragtop/tachfilter/index.htm
