140 speedo

[rellik god]

i installed a 140 speedo and i drove by a road speed sign that tells your speed
and it was 10 miles over how do i change the speed and is there any adustments .87 cv wagon stock rear gears in it

[86VickyLX]

i installed a 140 speedo and i drove by a road speed sign that tells your speed
and it was 10 miles over how do i change the speed and is there any adustments .87 cv wagon stock rear gears in it.

That doesn't really help. Some cars came with different rears stock. You'll probably need a different speedo gear. First, we'll need to find out which rear you have. Look on your driver's door, under AX for your axle code. And post it on here.

Second, are you running larger than stock wheels on your wagon?

[gadget73]

No idea how to adjust the speedometer. Is it 10 mph off across the board, or does it get more and more off the faster you go? If its 10 mph off across the board, the speedometer has a problem. If it gets farther off the faster you go, it may be correctable with a speedo gear change. Rear tire size will also throw off the speedometer. Are yours stock size?

[mrltd]

Those radar roadsigns are also kinda inaccurate. On an 800 mile trip of mine I went through about 10 of those, and went by at the same speed indicated by my speedo and they varied by 5 mph plus or minus.

The speedos are adjusted by moving the magnets. A shop can calibrate them.

[P72Ford]

Assuming the issue is the speedo, (and not larger tires, faulty speedo gear, etc) then MrLTD is right. There is a place not far from me that recalibrates speedometers, amongst other things.