Speedometer Calibration
Thread Starter
On The Tree
Joined: Apr 2007
Posts: 148
Likes: 0
From: Northvale, NJ
Speedometer Calibration My '00 SS speedometer reads a few mph high. I contacted the guy who sold it to me and he claims the rear is stock - but he thinks the calibration is off because of the white face dash he put in.
Does that make sense? Isn't the white face just an overlay?
What could be done to screw up / and now fix the calibration?
Does that make sense? Isn't the white face just an overlay?
What could be done to screw up / and now fix the calibration?
Here's what I did: BEFORE you take out the gauge cluster, tape down all needles where they are NOW!....Take the plastic protective overlay off, then, Put the needle on Zero, tape it down, put the cluster back in, take tape off of needle. Leave the Plastic overlay off for now, get a friend with a car, ride down the road in your car have him pace you at 10 mph, check your speedo, then 20 mph, check it again, then maybe 45 mph, check it again (you get the picture). If that doesn't work, you might have to go to a dealer.
Yes - It is because of the overlay. The needle needs to be removed from the post to replace the overlay.
The fix is very easy if you have access to a portable GPS:
- Set up the portable GPS in "map" mode and drive down a completely straight street.
- As you are driving, read the needle and the speed on the GPS. (The GPS will give you a 100% correct speed on a straight road.) Try several different speeds, like around 25 mph and 45 mph to confirm how far off you are.
- After you get the difference, take the cluster out, put it on a flat surface, pull the needle directly off of the post (carefully) and then put it back on subtracting/adding your difference.
- Re-test and enjoy.
The fix is very easy if you have access to a portable GPS:
- Set up the portable GPS in "map" mode and drive down a completely straight street.
- As you are driving, read the needle and the speed on the GPS. (The GPS will give you a 100% correct speed on a straight road.) Try several different speeds, like around 25 mph and 45 mph to confirm how far off you are.
- After you get the difference, take the cluster out, put it on a flat surface, pull the needle directly off of the post (carefully) and then put it back on subtracting/adding your difference.
- Re-test and enjoy.
Thread Starter
On The Tree
Joined: Apr 2007
Posts: 148
Likes: 0
From: Northvale, NJ
Yes - It is because of the overlay. The needle needs to be removed from the post to replace the overlay.
The fix is very easy if you have access to a portable GPS:
- Set up the portable GPS in "map" mode and drive down a completely straight street.
- As you are driving, read the needle and the speed on the GPS. (The GPS will give you a 100% correct speed on a straight road.) Try several different speeds, like around 25 mph and 45 mph to confirm how far off you are.
- After you get the difference, take the cluster out, put it on a flat surface, pull the needle directly off of the post (carefully) and then put it back on subtracting/adding your difference.
- Re-test and enjoy.
The fix is very easy if you have access to a portable GPS:
- Set up the portable GPS in "map" mode and drive down a completely straight street.
- As you are driving, read the needle and the speed on the GPS. (The GPS will give you a 100% correct speed on a straight road.) Try several different speeds, like around 25 mph and 45 mph to confirm how far off you are.
- After you get the difference, take the cluster out, put it on a flat surface, pull the needle directly off of the post (carefully) and then put it back on subtracting/adding your difference.
- Re-test and enjoy.
How tough is it to take out the cluster?
Very easy. If I recall correctly, you need to take off the cover under the steering column first. Then put the plastic bezel around the gagues. Then you unscrew the cluster and it comes straight out.
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The way I've done it is basically the same. Only pull the needle off and just lightly put it on reinstall the cluster wo the lense and drive the vehicle while looking at the scanner. Pull the needle while watching the speed and reinstall it until it's correct. I've got them dead on many times doing it this way. Find a non populated road to do it on. We have a bunch of them where we live so it's easy to do. I don't recommend crowded areas.
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On The Tree
Joined: Apr 2007
Posts: 148
Likes: 0
From: Northvale, NJ
But... seems like the perfect method. Thanks.
18s, 2000, calibrate, calibrator, camaro, correction, directions, gps, ls1tech, rear, recalibratiom, slp, speedo, speedometer, ss
