1966 Chrysler Newport

Electrical problem
1966 Chrysler Newport V8 Two Wheel Drive Automatic

I just installed a tachometer from glowshift but I cant get it show the wright tach of the engine it has a swish on the back that I turned to 8 cyl but the numbers showing on the displei dont matsh the idle speed, what do I need to do to fix this problem.
Please exscuse mi writing I am Icelandic: )
March 25, 2009.

Make sure it is turned to 8 and not 6. It may not be compatible with your ignition system either. I would check the ground and what side of the coil do you have it connnected to. Look over the installation instructions carefully you may have missed something.

Oct 7, 2009.