Unless you have the chip (which profile says you don't). Don't worry, a GREAT deal of cars have their needles off a few mph as they age...even moreso at the top end. Mine is off 6mph so I use a Techtom
Zheaven.com has a new, FASTER server! Latest update includes full writeup on the 3rd annual L.A. Sports Car Canyon Drive 07/30/01 -- Click my Z below to enter.