Re: volt gauge
I'm not sure which voltmeter you purchased that fits into the console, but I too purchased one that looks identical to the amp meter that it replaces and fits in the '69 console and it ABSOLUTELY IS NOT PLUG AND PLAY. You cannot just use the existing wires used to connect the factory amp meter to connect the voltmeter, this warning is clearly emphasized multiple times in the instructions. Your volt meter should have come with connection instructions and a template for drilling an extra hole to fit it into the console mount.
'69 Z/28, Lemans Blue/White Stripes, DZ302, Tremec Magnum, 4.10, Procar Elite Seats,
Custom Upholstery, Dynatech headers, 17" VWW V45's, 235/45, 275/40, C5 Front Brakes