The L-758DR is a great meter, it serves nearly all metering needs. Are you shooting into the sun, for sunrise and sunset? Or shooting subject lit by the rising or setting sun?
If the actual sunrise or sunset is the subject (shooting into the sun), I would spot meter the sun, sky area away from the sun, and important shadow areas in the image. Chances are there will be a large contrast range, and you will need to make a decision on how to fit the scene to the film capability. If shooting a subject lit by the rising or setting sun (shooting away from the sun), I would use incident metering from the camera position, with the dome pointed along the camera axis, provided the camera is in the same light as the subject. If the subject is lit the by the sun, and the camera is in shadow, then I would spot meter like the first example.