I'm not sure what it means....:

Recently, the green oil light on my 911T Targa 1970 (simplified dial) turns itself on when the car's engine idles.

When the revs are above 2.000 rpm, it turns itself off, but when I slow down and fall below those revs, it comes on again.

It used to light up only for a short period of time when I started the engine, and then turned itself off after that.

Do I have a problem with the oil pressure, or does the sensor needs to be adjusted?

Thanks for your help!