[camarojoe]

I would guess the center fuel gauge was more common on Z/28 than any other trim level of Camaro, simply because the only way a car received one is when a tachometer was specified but no console and/or console gauges were ordered. I would think quite a few Z's were spec'd this way in comparison with base cars, and even SS cars, as a tach was a vital part of owning a high revving Z/28, but a console was not. I believe a tach was even included with the Z/28 package for a portion of the model year, whereas a console and other gauges never were required. While rare, i think the majority of center fuel gauges would have been in the Z/28s, with maybe a handful in base, SS, and COPO cars. I don't think there's any breakdown of this, it's just my opinion.

FWIW, My dad also had a 69 Z non-console car with a center fuel guage. Seems like most i've ever seen/heard of were in Z cars.