Satish, Your method would only work on cars with electronic speedometers. For people like myself that have "older" cars with speedometer cables, Steve's idea would work. I don't know when MB started with electronic speedometers, but there are still quite a few of the older models, like mine, still on the road. This forum is for people who have questions and the people who offer their knowledge on these cars. To say your idea is better and that someone elses is "old and archaic", is rather strong language and just not polite. Steve has helped many people here with his knowledge and experience, and I would hate to see him stop contributing due to people shooting down his ideas, when he his only trying to help.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section