When your speedo reads 80mph, you'll actually be going 75mph. At 40, it's more like 37.5. I tried this in mine. Also, you will need to transfer the printed circuit from yours to the new cluster (I'm pretty sure this is the case for 98's. I know it is for 99+. Someone will correct me if I'm wrong). Just be careful when you pull the plug off of the back of the board.
You can verify your speed with the trip odometer self test proceedure. Hold in the trip odo button while starting the car. Let go when it shows "TEST", and then push the button repeatedly 'til you get to ENG (mph). This will give you the speed that your PCM is seeing. Good Luck!
'01 GT Auto- Bullitt Intake, VT Stage II's, 30# inj's, Hooker L/T's, UPR Tubular Frt & C-overs, Granatelli LCA's, SCT Pro-Racer Tuned, CAI, PI 3600, J-Mod, 4.10's, Cobra Brakes, SFC's...SOLD
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