Speedometer calibration...

[Old77]

Now that I have a denali cluster in my truck I need to calibrate my speedometer badly. What is my best option for doing this?

 

[great white]

OBDII Gassers are done through the PCM calibration iirc. Changing just a cluster shouldn't effect it unless the denali cluster is weird that way. A change in tires or gears is a different story.

Diesels are still on the old DRAC/vssb system. Move a couple jumpers and you're good to go, with a diesel that is....

 

[Old77]

OBDII Gassers are done through the PCM calibration iirc. Changing just a cluster shouldn't effect it unless the denali cluster is weird that way. A change in tires or gears is a different story.

Diesels are still on the old DRAC/vssb system. Move a couple jumpers and you're good to go, with a diesel that is....

Yeah, prior to cluster swap my speedo was off by 3-4 mph due to tire size. Now with the cluster swap it's off by 10+ I assume because it goes up to 120 mph when before it went up to 100 within the same "space" so to speak.

 

[95z71performer]

Mine is off by 5 or less on the 100 MPH speedo

 

[98_k1500]

Anyone just pulled the needle off and set it correct around 60 mph or so? It would read a little fast below 60 and a little slow above 60, but it would be much closer

 

[great white]

Oems test at 55 mph for accuracy iirc. Below or above that the error in a factory gauge set gets suspect. Usually bigger the further off 55 you get (either way).

That's why police clusters say something like "police" or "calibrated" on the gauge face.

It so when they pace you at a speed, it's admissible no matter what yours said....

 

[Old77]

Ok, so from all this I'm guessing that we're not sure of a good way to recalibrate a speedo?

 

[98_k1500]

Not without a good tuner.

 

[Crash]

Anyone just pulled the needle off and set it correct around 60 mph or so? It would read a little fast below 60 and a little slow above 60, but it would be much closer

Yes, the previous owner did. It reads faster up to 40 then slower above that. Shows 5 mph siting still.

 

[98_k1500]

Better than getting a ticket lol.