The instrument panel in A-Bodies can use an upgrade. The following link is to a custom gauge clusters:

Custom Gauge Clusters

 

Another useful upgrade is to switch to an electronic voltage regulator for the instrumentation.  The OEM voltage regulator is a mechanical device and its voltage varies from its nominal 5V rating as it heats up.An electronic voltage regulator is more reliable and provides a constant voltage.

AllPar - Solid State Instrumentation Voltage Regulator