getting a lot of variances between different manual trans speedo for E67s. The 06 07 ctsv is set as a final drive ratio of 1:1, yet its true ratio is 3:73??? makes no sense as the V.S.S is at the trans tail shaft. Factory 2.9L manual trans Colorado has the tire diameter set to 269.96"!!!!!!!!!! and efi gives a warning saying to calculate it manually or that it might be a manual trans application? Which it is, but then how do I calculate the speedo section?

I have a MN12 T-56 with 3:73 and P0235/50R17 tires. 17 tooth trans reluctor.

Here is a factory 2.9L tune manual untouched from GM SPS see the final drive ratio in the calculator as 0.00 Yet H0122 is 3.73, but H0120 is set to 1.00 is a factory manual supposed to have the final ratio as 1.00? Also see the massive 269.96" tire pretty sure the factory tire is 26.96" ?? it is correct to have a 40 tooth reluctor
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Here is in theory How I'd edit the manual then? I have 26.25"tires that becomes 262.5" and 17 tooth reluctor

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And here is How I'd normally edit the speedo table

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Also I usually set the H0135 tire correction to zero I've never understood that table??

And I make H0139, H0140, H0152 all match what efi calculated, for H0139, never understood why they have so many tables in there?

I'm having trouble getting cruise to work with any of these settings.