Here is a picture of the 1970 Chaparral Camaro dash, and the three gauges on the far left of the dash appear to have a black bezel. I'd also guess they were a Stewart-Warner 2 1/16" unit, but I don't have a better picture that would allow me to confirm that.
These items noted in the Chaparral Camaro are NOT the later "Heavy Duty" style Stewart-Warner gauge. Though the "Heavy Duty" Stewart Warner gauges had a black bezel, it is a distinctly different shape.
Does anyone know anything about a vintage Stewart-Warner gauge that had the classic style bezel, but in black instead of the more common stainless bezel?