iam trying to convert my idiot light dash to a tach dash but iam having trouble with the wiring. At first i noticed that the location of the wires in the plug for the cluster where different. so i traced the wires and placed them back in the plug corresponding with the printed circuit. still something is wrong. for example when i turn on the right turn signal the temp. gauge goes crazy. i am thinking it is a ground problem but i am not sure. if anyone has a diagram or any suggestions i would greatly appreciate it.

This ite: http://www.endrud.net/gauges/ may help with the wiring. It does sound as if you do not have proper grounding.
rick