I need a P59 2003-2004 12587603 OS ID Trailblazer 5.3L tune to work with my gauges, can I do a write entire on a 2007 P59 120288 OS ID? Then I want to use the data bits turn off ETC, and the related codes, hook up IAC control, cable throttle. And switch from a 4L60E to T56 manual. Is all this possible?

Reason being I need serial speedo output same as trailblazer, and serial tach, serial fuel gauge. All from the trailblazer

And I want T56 reverse lockout to work, and the V.S.S from it to work

I also have a cable throttle body.


Currently using 1220288 Po1, but speedo does not work, I cannot find a way to change it from (reptos??) to serial speedo output. All the gauges work, but the fuel gauge and speedo do not.

How many credits would it take to do this?

Can any year P59 be reflashed with any year P59 calibration?