peterbilt 379 dip switch settings help

Amtek speedo full manual https://www.ametekvis.com/-/media/a...dometer_calibration_switch_settings.pdf?la=en

Cross multiplication works awesome to get it bang on.

Current N ........................... X
---------------- = ........... ----------------
Speedo speed ............... GPs speed


#### forum keeps erasing the spaces so i have to use periods. Kinda confusing but if you know cross multiplication it will make sense

 

Aaah - we didn’t ask the question, is it a factory guage or Amtek.

Are the dip switch settings the same on both?

 

Amtek makes the factory gauge. Should be the same settings

 

Thank you - didn’t know that.

 

I fought mine using Amtek book 2000 379, Pete in Missoula finally helped, there is a separate book used 98-00, you have to ask one of the older guys they'll fix you up.

 

Just reviewed that post - the part about it being ok and then slowing down.

Guess it wouldn’t hurt to check installation of sensor, I think it’s ‘all in, then 2 turns back out’. ?

Check sensor for ferrous junk.

Then - the dreaded odometer replacement.

That’s all I got.