My "pressure switch" failed in a similar manner. When warm and at idle, the red light was on with ~ 1.5 bar on the guage. At around 3.5 bar the light would go out. As I understand it, they are a similar type of gizmo, one controls a light, one controls a guage.
You'll probably be buying a new one anyhow, so you could start there. Then take it to sears and figure out what size wrench to buy. It's really like 22 or 24mm, which is why I didn't remove it when my engine was out.
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1983 911 SC Targa - 1990 944 S2
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