Can't get my guages to work #&#%!

Hello coyote- If you indeed have the rallye dash like what`s used in the 67-69 Cudas, then there is no plug-in v/limiter as Dave said. The limiter is actually inside the fuel gauge and you`ll have to pull the fuel gauge from the cluster and either send it out for repair, or remove the limiter from the gauge, and do the solid state replacement. The parts can be had at any Radio Shack for about $5.00 and it will restore a constant 5 volts to all of your gauges and steady them. If you install the chip your gauges will likely work better than they ever did.Let us know if you need any more help.