From what I've seen, you can have a tach without a console, and the fuel gauge would then be front and center (where you usually see a clock)
Very unusual setup.
If you ordered gauges/console, you got the clock front and center, and the dash tach. Or it could be like mine, no tach, no console, no clock. Just a speedo and a fuel gauge. I don't see alot like this either, but I suspect not because it's rare, but because most people convert them.
The U16 Tachometer option became available later in the model year; earliest cars appeared around May '69. Chevrolet mandated U16 or U17 [gauges] around January '69 but for some reason it didn't take effect until May. U16 is rare; only 1,410 cars built with it. Many Z/28s built without either.