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If you go with the overlays though you have to pull the needles off, which can be a pain in the ass to get them set correctly again. Make sure you know where they all are at when you pull them.
+1
The previous owner put on the overlay. He did a pretty good job on everything except the speedomoter. My first tuner thought I had 3.73 gears and set the computer accordingly. It cause my odometer to read slow by 14%. My second tuner thought I had 3.55 gears and set the computer accordingly. It cause my odometer to be off 8.5%. I jacked up the car and checked. I had 3.27 gears (at the time).
If you just snap the speedometer needle on with the car setting still it will read 7 mph faster than what you are actually driving.
To put the speedometer on correctly you have to put the odometer in test mod so that it will display mph and then snap the needle on with the wheels turning. I jacked up the car to do this. I've heard some say they just drove down the road. I'm not that coordinated. I would have ended up in a ditch.
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370 rwhp/377 rwtq
Procharger P1SC; BBK 75mm TB/Plenum
BBK LT Headers/catted mid-pipe
Miezere Electric Water Pump
13" Cobra brakes
+1
The previous owner put on the overlay. He did a pretty good job on everything except the speedomoter. My first tuner thought I had 3.73 gears and set the computer accordingly. It cause my odometer to read slow by 14%. My second tuner thought I had 3.55 gears and set the computer accordingly. It cause my odometer to be off 8.5%. I jacked up the car and checked. I had 3.27 gears (at the time).
If you just snap the speedometer needle on with the car setting still it will read 7 mph faster than what you are actually driving.
To put the speedometer on correctly you have to put the odometer in test mod so that it will display mph and then snap the needle on with the wheels turning. I jacked up the car to do this. I've heard some say they just drove down the road. I'm not that coordinated. I would have ended up in a ditch.
Yeah, I had the wifey help while I was driving.
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2002 GT Vert.
Bassani Mid-Length Headers
Bassani X-Pipe
Bassani Catback
Pro-5.0
FR 3.73
Professional Products 75 tb and plenum
JLT Ram Air
Sniper DF Custom Tune
CHeck out the Simco white gauge overlay kit sold by American Muscle. I am replacing the ones I got from US SPEEDO which I have never liked with the Simco gauge kit.
i have the am white face cluster,was there when i bought the car,the speedometer needle dosent move till i get up to 10 or 15mph,then it is still off by that much.you have any ideas what is wrong?
Put your odometer in test mode. Hold down on the button, turn the ignition key on but do not start the motor. The odometer will do a self test. When its done press the button a few times until the display read ENG00000. The odometer will now display your speed in miles per hour. Start the car and drive down the road. You can compare your speedometer to the odometer. They should read exactly the same. If not the needle was put on wrong when the overlay was installed.
The speedometer needle typically doesn't move at all until the car reaches 7-10 mph. If the needle was put back on with the car setting still then it will be off my that amount. Mine was off a constant 7 mph.
__________________
370 rwhp/377 rwtq
Procharger P1SC; BBK 75mm TB/Plenum
BBK LT Headers/catted mid-pipe
Miezere Electric Water Pump
13" Cobra brakes
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