2001 peterbilt speedometer help

Try setting the dip switches the same as the speedo you took out.

 

I'm assuming that the new speedo is a "peterbilt" one. I'ld call a dealer and talk to parts or service and have them figure it out. The new speedo isn't a direct replacement of the original so if they gave you a different one, they should figure out how to set it up I would think.

 

You need to set it for being driven off the ECM. There should be a setting in the instructions to allow for it.

 

You need to contact the manufacturer of the speedometer or google them for installation instructions. Peterbilt parts guys don't have a clue how to set speedometers and on an 01 model it won't have anything to do with your ECM. There is a sending unit on the back side of your transmission but it won't run through the ECM. The ECM has no idea how fast it's moving down the road. Just the rpm speed it's keeping.

 

Heavypete if you can send me those installation instructions I could probably tell you how to set it

 

My speedo for my kw was same way has dip swicthes on back when i replaced it i slowly walked up the mph to meet what my tach and gps read. Did first setting by book to get starting point then went up from there. hope that helps you got mine within 1mph.