Anybody have any information on how to calibrate the digital speedometer... I'm off about 5 mile an hour

 

You presumably have a geared sensor, rather than a cable right? Short of re-gearing the sensor at the tail-housing... I doubt it. This site has some stock tiny gears for sale...

https://khkgears2.net/catalog5/

I would give Marlin Crawler or LC Engineering a call, those guys have seen it all. They may know of a way. I'm sure by now someone has cracked open an ECM on these trucks.

 

Some here have used this device to re-calibrate their electric (non-cable) speedometers when changing tire size, no idea if it would work with a digital speedo?

https://www.summitracing.com/parts/dak-sgi-5e/overview/

 

Thanks I'll call MC and LCE

 

It might be possible to alter the digital dash, but the odometer is still going to be off since it uses a speedometer cable from transmission to dash.

​​​​You have to switch the gear on the cable at a minimum.

..
Speedometer isn't off five miles per hour, it's off X% unless it says five sitting still. A bit of a peeve of mine but I digress..

You are allowed somewhere between five and ten percent in the DOT regulations iirc.

 

thanks I'll check the cable and see of its like other geared ends that can be changed to less or more teeth...

 

WHY is it off? Do you have over(under)-sized tires?

The gears driving the speedometer don't just wear down. Something is causing this.

 

yes 31" so not a huge tire but enough to make 50mph showing on the digital dash, is actually 55 mph by android speedometer app...