i dont get it, speedo is way off

SC UL8R1990

Registered User
Ever since i installed the 145mph speedo on my 90SC 5speed the speedometer is showing too fast. It's really bad( about 5-8mph off!!!). What could have caused this? I already know i have shorter than stock tires and it should only be a 3.3% difference on the speedo gauge. so thats barely 1 MPH at any given speed between 0-65. Is it possible that my SC has had gears installed? is it possibly something wrong with my 145mph speedo?

please help, this is really starting to bug me :confused: :( :(
 
ive got 225/55/zr16 BF Goodrich G-Force T/A's

is it possible that the 145mph speedo came out of an automatic supercoupe and i just neet to get another speedo gear since mine is a 5speed??
 
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