I need some help. I am trying to get my new 69' on the road and ran into an issue with the sending unit. I was under the truck trying to locate the source of a small gas leak. I found the sending unit being held in with these screws and home made washers. This is obviously not right. My problem is I don't have any experience with this style tank. A regular lock ring doesn't work with this. I was wondering if anyone knows what type of locking mechanism holds the sending unit in with this tank or is this just a total rigged job. thanks!!