Need to know what your question is.
Trailblazer doesn't have a cable. There is a speed sensor on the Transmission. The guage is electronic and is the most common problem in the Trailblazer.
The 2005 Trailblazer has a 22 gallon tank.
Keyless entry was an option for the 2005 Chevrolet trailblazer model year. Most 2005 Chevrolet trailblazers came with the keyless option.
The dealer has to do that.
2005 chevy trailbazer
Call your local Chevrolet dealer and ask them if there are any recalls on your vehicle. Have the VIN handy because they're going to ask for it.
There are several ways to fix the secondary air injection system in a 2005 Chevrolet trailblazer. The most common fix is; changing the air filter.
The 2005 Chevrolet trailblazer stereo wiring diagram can be obtained from most Chevrolet dealerships. The stereo wiring diagram can also be found at most auto-parts stores.
With a scan tool.
The coolant temperature sensor, on a 2005 Chevrolet trailblazer 4.2 liter engine, is located just above the thermostat housing. The thermostat housing is located in the front of the engine.
That's probably for the instrument cluster.
It's a 6 cyl. http://autos.msn.com/research/vip/Spec_Glance.aspx?year=2005&make=Chevrolet&model=TrailBlazer&trimid=-1