Oil pressure sensot - been there done that on my '83ZXT...
Water pump - mine took out the fan when it went...
AFM to turbo boot - replaced when it failed - the people that put the T3/T4 in LEFT THE SPRING OUT that keeps it from collapsing. Found another one and cut it to fit, along with removing, cutting the spring and getting it back in - NOT FUN!
Other than that - 176K miles and still goin' strong. (Did replace alternator w/a 130 amp Taurus unit, and have changed Digital to analog dash, and on general principles converted to manual HVAC)...