The case around my tach has cracked over the years and now the lip around the front edge of the tach has totally separated from the rest of the case so the tach falls though the dash. Obviously I need a new tach but I don't know which one to buy to replace it. My tach is a VDO that tops out at 6000 rpm while all the ones I see on Overtons, go up to 7000 rpm. Is that going to make a difference? My Tige is a 1998 21i that has a MarinePower USA engine in it that Tige was actually testing for future use. I bought my boat straight from Tige in Abilene and it had been one their team boats so it has a couple of funny things about it.