Speedo calibration dip switches

If no one gets back to you on this and you have to play with it to get it right make yourself a bit chart. The switches have values of 1, 2 4, 8, 16, 32, 64, and 128. Figure out the value of the current setting by adding up the values of the on switches and start dropping it down and keep track of what it does and you'll be able to get a pretty close in a hurry.

 

Im in the same boat. Mine is only off 5 mph but it would be nice to get in within a mph or two if not dead on. Any one have a 379 pete with 3.70 rears lp 22.5 rubber and a 12.7 detroit that they could snap a pic of the back of there speedo.

 

for whos truck?

 

ill check that out

 

I have old International speedo in my workshop

we fit digital tachograph there for use in EU, so I removed old speedo and I wanted to use for any custom project. I will post some pics there, becouse I have no info how to do it

only one thing I know that old US speedometers had the same calibration way as kienzle 1314

 

Do a search on "speedometer dip switch settings" and the 2nd Google result has a bit chart on it, and instructions on how to Calc the value to program. It's a pdf link I can't copy on phone.