vance..going through same thing on melissas coupe....no matter what ecu...p28 p30 p72 p06...all the same thing....hooked up external tach(autometer) and is revving to correct rpm unlike stock tach, which would be either 6800 and sometimes like 8000...depending on outside temp...but always stock rev limit on autometer....just figured id let u know, at least im not the only one with this prob...lol