Sir,
Maybe Iam completely wrong, but if you read what we have written (surely taken some time to educate you) you will not be rushing to conclusions. There is no Oil Light Sensor in 87 944's, now what you have stated as seeing in your wiring diagram, please paste it to the post and I shall tell you where it leads.
I would suggest you read up on Oil Pressure Sending Units and see what their function then read up on the Pressue Relief Valve and its function.
if all fails open another thread
gluck