Speedometer adjustment
July 4th, 2020, 03:53 PM
#1
No it's not a parts car!!
Thread Starter
Join Date: Nov 2010
Location: NE, Illinois
Posts: 427
Speedometer adjustment
My Speedometer pointer needle is sitting a 5 MPH when car is in park, when I'm driving it is reading 5 mph above my actual speed.
I have had this car for about 30 years, but only just started driving it again after sitting 15 years before restoring the Chassis. I don't remember it being an issue before.
I was wondering if there is a way to calibrate the speedometer so it is reading accurately.
I cant find anything online or in the CSM discussing this.
It is a stock 72 cutlass supreme, all original Th350 trans and 10"rear-end with original 14" ssII wheels, No upgrades
any suggestions or ideas would be greatly appreciated
I have had this car for about 30 years, but only just started driving it again after sitting 15 years before restoring the Chassis. I don't remember it being an issue before.
I was wondering if there is a way to calibrate the speedometer so it is reading accurately.
I cant find anything online or in the CSM discussing this.
It is a stock 72 cutlass supreme, all original Th350 trans and 10"rear-end with original 14" ssII wheels, No upgrades
any suggestions or ideas would be greatly appreciated
July 4th, 2020, 10:33 PM
#2
Phantom Phixer
Join Date: Dec 2011
Location: Apopka, FL
Posts: 4,674
Because of the tolerances involved , and the specialized equipment needed , speedometer repair is not a DIY proposition .
Back in the day , speedometer shops were in every good sized town . With the advent of electronic speedometers , most went away .
The best place to look for a speedometer shop is in some place like Hemmings Motor News .
Back in the day , speedometer shops were in every good sized town . With the advent of electronic speedometers , most went away .
The best place to look for a speedometer shop is in some place like Hemmings Motor News .
Last edited by Charlie Jones; July 4th, 2020 at 10:41 PM.
July 5th, 2020, 07:46 AM
#3
No it's not a parts car!!
Thread Starter
Join Date: Nov 2010
Location: NE, Illinois
Posts: 427
Thank you
I was hoping this was something I could do myself
but I guess I'll need to see if I can find a shop to do the work.
Does anyone have a suggestion for a shop in the Chicago area?
I was hoping this was something I could do myself
but I guess I'll need to see if I can find a shop to do the work.
Does anyone have a suggestion for a shop in the Chicago area?
Last edited by Schne442; July 5th, 2020 at 07:48 AM.
July 5th, 2020, 07:57 AM
#4
Registered User
Join Date: Jun 2014
Location: Ft. Wayne, IN
Posts: 1,198
Mine's got the opposite problem, it reads 4 MPH low at all speeds. This is a "zero offset" error in the speedo's calibration. There might be a staked factory adjustment that was not intended to be used later, or it might not be adjustable at all. One thing that can be done is to remove the needle from the shaft and replace it so that is properly points at "0", but this would require near complete disassembly of the unit.
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