If you have access to an OBDII Bluetooth reader and app on your phone (like Torque Pro), use it to see what is coming from the computer. If this reads OK and the needle is still not accurate, I would say that there is something physically wrong with the tach (electrical or mechanical)
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mults
40th Anniversary 'Z', 312.06HP/260.58TQ (Dynosty EcuTek Tune)
Build Date/Number: 1/27/2010 #706
Berk HFC + CBE, R2C CAI, Clear Bra, Cleveland Z Club
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