[ribsey80]

Hi guys. I am new to this site but have been a mustang freak forever. I have a 92 5.0 convertible that ive supercharged and the whole bit. I just recently purchased a 94 hardtop 5.0, 5spd that is stock except rearend gears, full exhaust with headers and flows and a Superchip. I am having a couple problems that I cant figure out. First, my tach has a mind of its own. It works one minute and then not the next. It even goes backwards sometimes. Second, it seems to be eating fuel. ( Not just because of my heavy foot ) I can only get about 300 klms to a tank and she pushes a little bit of black every now and then like its overfueling. Third, she will "ping" ( very rarely ) if I step into it even with 94 octane. All these may be related. Could the computer be trying to compensate for the tach not working? Any help or advice would be greatly appreciated. Thank you