If both your cruise control and MPG/speed functions on your OBC don't work or are flaky likely the connector on the back of your cluster is making poor contact like mine was. Both the OBC and cruise control module get their speed input from a small blue connector that attaches to the circuit board of the speedometer through a hole in the back of the cluster housing.
The connector.


Can barely see the contacts in there.

There's the top one

Pop the rear cover off

Pop a terminal out paying attention that they are held in with small clips. I used a small flathead screwdriver


The bare terminal

I cleaned the contact surfaces with some crocus cloth, likely an unneeded step

Gently bend the two "legs" towards each other and reinstall


Before and after for the other side


Also cleaned the circuit board contacts a bit, again probably unneeded, they were pretty shiny as is

Reinstall the cluster and you should be set. The blue connector definitely took a good push to get on compared to what it used to be. Go for a drive and enjoy cruise and seeing your gas mileage!
The connector.


Can barely see the contacts in there.

There's the top one

Pop the rear cover off

Pop a terminal out paying attention that they are held in with small clips. I used a small flathead screwdriver


The bare terminal

I cleaned the contact surfaces with some crocus cloth, likely an unneeded step

Gently bend the two "legs" towards each other and reinstall


Before and after for the other side


Also cleaned the circuit board contacts a bit, again probably unneeded, they were pretty shiny as is

Reinstall the cluster and you should be set. The blue connector definitely took a good push to get on compared to what it used to be. Go for a drive and enjoy cruise and seeing your gas mileage!

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