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I have been in contact with VDO regarding re-calibrating my tachometer. I have
included the information John gave me in case someone else needs it. 2 points
for VDO for at least attempting to provide support for their 30 year old
products !! how many other companies will do this for you.
> Boyd,
> This is quite an old item you have there. You were kind of vague in
> your information you provided in your e-mail. First thing to look for is
> a
> knob on the back of the tach. Usually looks like a straight screwdriver
> head
> and has a line that goes around it that starts thin and gets thicker as it
> goes around the potentiometer.
> What type of tach is this: automotive, industrial or marine? Are
> there any part numbers on the housing? What is the maximum on the dial?
> How
> does the tach get it's signal/sending unit? These are all important items
> we
> need to know to identify such an old item.
> Please let me know if I can be of any other assistance.
> thank you
> John A. Stover
> Technical Service Advisor
> VDO North America
> 188 Brooke Rd.
> Winchester, VA 22603
> (540) 678-2033
> jstover@vdo.com
> John,
>
> This is an automotive tach made by vdo. date stamp 12/69.
>
> max rpm is 6000.
>
> signal gets to tach through single wire from neg. post on coil. (center
> post in
> back image).
>
> I dont see the screw setting you described in your email (the one with the
> wide
> to skinny line around it).
>
> I had heard that this particular tach was a VW dealer installed option in
> the
> 60's if that helps.
>
> Stamping on the back indicates for 4 cylinder use ( 4Zyl xxxxxx - cannot
> remember the rest)
>
> diameter of the tach is 2 3/8 inches.
>
> I have attached 2 .GIF images so that you can see the instrument. One is
> front,
> one is back.
>
> Any and all information you can provide me with would be greatly
> appreciated
> (especially re-calibration).
>
> thanks in advance.
>
>
> Boyd Drew
>
> (See attached file: tachfrnt.gif)(See attached file: tachback.gif)
Boyd,
To calibrate this item it has to be dismantled which means you have
to cut the front bezel off and then have another to replace it. There are
two companies in California that I would suggest to perform this process:
United Speedometer
909/684-2517
e-mail usimail@earthlink.net
Palo Alto Speedo
650/ 323-0243
e-mail info@paspeedo.com
I would like to do this for you here but I am not 100% sure that we
would have the correct bezel to replace it. You may want to send the same
pictures to the speedo shops and see what they think. Please let me know if
I can be of any other assistance.
thanks
John A. Stover
Technical Service Advisor
VDO North America
188 Brooke Rd.
Winchester, VA 22603
(540) 678-2033
jstover@vdo.com