The horn on a 2005 Pontiac Sunfire, the actual horn is located behind the front bumper. To make the horn sound, you press on the center of the steering wheel.
Your Sunfire has two coil packs, located on the back side of the engine as viewed from the front of the car. Find a spark plug wire and follow it back.
You can find the 2005 Pontiac Sunfire air filter the inside of the air filter housing.. The air filter housing will be in the engine compartment.
You cannot download the service manual for a 2005 Pontiac Sunfire for free. You will need to call the manufacturer and purchase a new manual.
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Are you really asking about the speedometer, or are you asking about the cable? It's hard for me to believe that you don't know where your speedo is.
I think that in all of the Sunfire engines, the plugs are in a row across the front of the engine. Try locating and following the plug wires to help you. FriPilot
Have a look at this webpage; http://consumerguideauto.howstuffworks.com/1995-to-2005-pontiac-sunfire-6.htm It has a pretty good history of Sunfire changes and options. FriPilot
Look under the vehicle - follow the fuel line from the tankRemove clamps and support to replace