Do not waste your money, it is garbage. It looks great, but it works for about 50 miles or so, then the needle bounces so badly it is useless. By ounces, I mean it swings between 2 and 6000 rpm! I tried 2 of them. I can't believe they still sell this, because they gave me my money back instead of sending another unit stating it was a known problem. I ended up getting a gauge from a forum member, then restoring it using one of Marcel's kits. Hope this helps.