[W126 Coupe] Low oil pressure light

[Stein Stromsoe]

After my recent radiator issue the oil pressure light stays on permanently.
The pressure is good, and temprature normal.
I can not help but belive the switch or associated wireing to be shorted 
out.
Does anyone know where the switch is located on the 119 engine?

Thanks,
Stein
1992 400E 143K miles, only got hot once....