Help once again! I ordered a new Water Temp Sensor for my '91 300E in hopes that it might help solve my "warm idling" issue but I can't figure out what tool to use to get that little sucker outta there. It takes a 7/8 socket, but it won't fit over the head and there's no room towards the back side to slide the socket over if it could go on. Tried to get a wrench in there but also no room. Is there a special tool for this that I need to get?