Finally hooked my tach[factory] to the MSD box. MSD said I didn't need any adapter, but I think it reads a little high. Haven't borrowed another tach to check yet. My real problem is the needle on the tach appears to stick around 2300 RPM. Won't go past 2500 and is slow to come down. Looks like it won't rotate freely in that area of the gauge. Has anyone had this problem? Any ideas on cleaning the gauge mechanism? Thanks.