The road labelled Wilkawallina Road is actually known as Wirrealpa Road (see official state map) https://sappa.plan.sa.gov.au/
from the Flinders Ranges Way through to Wirrealpa Station where the road intersects the North Flinders Road.

From this intersection north what is labelled as Chambers Gorge Road should be renamed Wirrealpa Road.
South of this intersection is known as Erudina Road (not Chambers Gorge Road) all the way to Tea Tree Road.

I recently travelled the Wirrealpa Road and don't recall any street name signs at any of the three intersections.

Wilkawillina Road is actually a track that runs from Wirrealpa Road to the Wilkawillinna Gorge area (start of a guided walk).