HELP!!! 1995 electrical problems???

My friend just got a 1995 oldsmobile Silhouette, rung rough (needs tune up/exhaust) and has a lot of problems that i am hoping are all linked. probelms are as follows:

-Tach/speedometer dont work
-Blower front or rear dont work
-ABS light on
-Traction control light on
-Low gas light on
-power windows dont work
-at full throdle its slow
-radio works sometimes not others
-Chms when lights are on
-auto door not working and a few other problems

is the ECU bad and its in limp mode, bad ground, abs module bad? i checked the relays and fuse to no luck so anyhrlp would be great... THANKS...