-The Instrument Panel needs to be repaired, which may help your gas gauge situation. That costs $200-400 depending on what is wrong.
-A new radio speaker is about $100 or less installed.
-Need to have the fuel leak inspected ASAP, that is safety issue!!
-Need to have the wiper motor inspected, it may just be a switch or loose linkage.
-need to have the Blower motor inspected, could jammed up with debris etc., the fact that it works some what is good news.
- window repair runs $300-400
Hope that this gives you guidelines.
Or look for another car in better condition, you can most likely find one for $3000-4000