The grey/black wire plug only seems to be in the early car looms but, as detailed in the link to the forum discussions from JohnMat, it's there on the speedo plug and works in the same way. There is a lot of good information here...somewhere. In the early days of warranty servicing I was palmed off with "wheel speed sensor cleaned" answers to my speedometer inaccuracy questions to Morgan dealers. It really make you wonder what information they were given when the M3W was introduced, very little I guess.
