Yes
Yes
No. Different connectors, different lengths
Yep. It will be a direct bolt in. You will need to replace trans w/ 2wd trans and get the drive shaft while your at it. Be sure you get the same wheel base or you may find yourself looking for the right driveshaft.
TH350
I own an 84 trans am. In the 85 models typically there will be a 5.0 leter V8.
motors are the same but there on differant sides the left to a 84-88 will fit the right to a 90-96 and the right to a 84-88 will fit the left of a 90-96
No
Depends on engine, transmission, gearing, etc.
my uncles 84 fiero only opens with keys. My Fiero has a button on the top right of the gauge cluster that will open the trunk. It has to have a battery or the engine running to do so though.
To fix the gauges on an '84 C10, start by checking the fuses related to the instrument cluster to ensure they're not blown. Next, inspect the wiring harness for any loose connections or damaged wires, as these can cause gauge malfunction. If the wiring looks good, consider testing the individual gauges and sending units with a multimeter to determine if they are functioning properly. Lastly, if necessary, you might need to replace the gauges or the entire instrument cluster.
Auto, or 5 speed ?
Sounds like a bad gauge sensor or a bad tank sensor (or both).