Can anyone tell me the exact position the ring gear should be in on a 1990 740 for the rpm sensor. Theres an arrow a void where there are no holes and two magnetic pins where should they be positioned and how can I check if its already installed besides takeing out the starter. When I hook up a timing light it shows 20 degs, it will run for about 10mins then quit and starts right back up hot or cold. I think its off a bolt hole on the ring gear. I need to know where all three sections should be the pins the void and the arrow. Thanks in advance.