ok does anyone have a chart that shows what speedo gear i need to correct my speedometer? its the truck in my sig

 

This place has some good info....

Ford Ranger/BroncoII speedometer gear change/calibration

 

Recalibrate Your Speedometer After Changing Tire Size

#1 Measure your tires with 3 rolling stops by marking your tire with a piece of chalk and the ground. Make a mark at each 360 degree rotation until you do it 3 times.

#2 Measure the distance of the 3 lines you made and then divide them by 3.14. Mine was 301 divided by 3.14 = 95.8 or 958 by dropping the decimal.

#2a Or take a piece of string and go around the outside circumference and multiply times 3.

#3 To set the calibration, ground the single wire connector under the glove box it says PSOM (Programable Speedometer Opdometer Module). (Yes there is only one and it has a spade type plug on the end). I used a wire with clips on both ends to ground the plug to a screw under the dash or try a test light and use the clip end to the PSOM and the other jam in a door hinge. Now look at your speedometer on the face of your dash while sitting in the drivers seat and there should be a "reset" button and a "select" button. While holding the reset button in on the trip meter, turn the ignition to 'on' while the wire is still grounded. Let go of the reset button. The speedometer display will sweep once and will show a code of some kind then push the "reset" button in again and the existing code will be displayed with RECAL?, mine said 976 RECAL? Now you enter your new code you came up with by dividing the rolling measurement by Pi or 3.14 by pushing the "select" button until it gets to the new calibration code number. You may have to push “select” a whole bunch of times until you get to your code. If you turn off the key at this point the original code will not be changed or any of the 6 lives will not be used. To store your new code press “Reset”. Turn off the key. Unplug the ground wire. To check the new calibration, use the mile markers on the interstate. Run an indicated 60 mph and it should take exactly 60 seconds to go 1 mile.

Warning: You can only change the calibration 6 times without replacing the module. Your Ford dealer should be able to do this for you too if you aren't comfortable doing it yourself.

Good luck

 

hey thanks for the reply but i have a 91 with mechanical guages...so i was wanting the chart that shows me what speedo gear i need to buy to adjust this, but thanks for the reply
Jared

 

Do a web search for speedometer gears and you can probably find one. I think TCI might have one on their site. Almost any good tranny shop should be able to help you

 

The Ranger Station dot com has some nice articles in the Tech Library and charts on this, you need to know what speedo drive gear you currently have to determine what the appropriate change will be. I can't post a link to that site here it gets deleted for some reason...

 

is your odometer digital or mechanical? if it is digital then you can set it through the computer, free and no need for parts