Ford Repair: Speedometer acting wierd, ford contour, stock dash


Question
Excuse my ignorance, but what do you mean the correct dash cluster?
The cluster I put in has a tach, and the original one doesn't, but it is for an identical year and everything. And I'm pretty sure that people have done this before, the wiring clips fit and everything, so I guess i assumed that it was the right cluster. If you know what I mean. Thanks

-Peter


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Followup To
Question -
Dear sir, I own a 1998 Ford contour lx 2.0L 4cyl zetec. Standard transmission.

I recently replaced my stock dash cluster, which did not have a tachometer, with a 1998 contour 2.0L dash cluster that has a tachometer.

I installed the new cluster, and started that car. The tachometer seems to work fine, and all the lights and gauges seem to have no problem, except for the speedometer.

The speedometer is at zero when the car is running but not moving, but as soon as you start to move it is apparent that it doesn't work correctly. The speed rises much too rapidly, for example, in 1st gear and 2000rpms the speedo reads aobut 35 mph.
And in 2nd gear at 2000rpms, the speedo reads about 50-55mph, and is proportionally off in each gear.

It does not appear to wander or stick anywhere, simply it reads far too fast.
I don't know what's causing this, and am not sure where to start as far as fixing it.

Any help or suggestions would be appreciated.
The speedometer was purchased second hand for what it's worth, but as far as I know has no known problems. Thanks!
Answer -
Hello and thanks for the question...I'll try to help.
 I would suggest that you get the correct dash cluster and install that---they are calibrated and can not be interchanged.
Hope this helps,
Erik

Answer
Hello and thanks for the reply...I'll try to help.
 What it means is that, even though the connectors fit, they are different. They are calibrated, gages and sensors to each other. You also mentioned, that the original does not have a tach, where as the new one does.........different.
Hope this helps,
Erik