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Well I tried it. Fastest speedometer will accept is about 200mph. That would take 250 hours so I'll just pay to have it changed.

I recently replaced my instrument cluster and the mileage is about 50,000 miles too low. I was going to pay to have it corrected but I was looking at the speedometer tuning on hptuners.

I think I...

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I'm actually looking for the same thing. I assume a stock 2wd tune would accomplish this. I see several stock tunes but idk if they are 4wd or rwd. Anyone have a stock trailblazer rwd 4.2 tune?