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Date:         Mon, 29 Jul 2002 13:12:39 -0400
Reply-To:     Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
Subject:      Speedometer Calibration
Comments: To: Rocky.R.Snyder@usa.dupont.com, jfmaurer@juno.com
Content-Type: text/plain; charset=us-ascii

I repaired my '89 Jetta odometer a few months back (and more recently, an '87 Vanagon odometer) using a new gear purchased from Palo Alto Speedometer. The only problem I had with the repair was determining at what position to place the speedometer needle back on the shaft. If you just stick it on the peg with the clock spring fully relaxed, it will read fast, as much as 8 or 10 mph. When I did my Jetta, I pre-loaded the spring slightly (I guessed about 10 mph) and sure enough, it read 10 mph slow! Yesterday I finally got around to pulling out the speedometer ( a bit more work on the Jetta than the Vanagon) and tried to figure out a reliable method for placing the needle back on the shaft. It appears there is a zero slash mark below the 10 mph "peg" that you can't see once the speedometer is in place. On the clock spring collar there is a line that needs to be straight up (12 o'clock) while you are putting on the needle. If you put the needle on to point to the zero slash mark, you can then lift the needle past the 10 mph "peg". This will pre-load the sping a little and should get you pretty close. My Jetta's speedometer is back to stock specs, which means it reads about 3 mph fast at 60 mph. I could probably get it right on (better then stock) if I really wanted to. I want to check it a few more times with the interstate mileage markers. I would be interested in hearing from anyone else who has had experience with this needle problem. I didn't notice this zero slash mark before on the Vanagon speedometer, but I am sure it is there. They are similar VDO units and the replacement gear is the same.

Jay

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