Yes you could install the sensor under the tmic of you wanted to. Alternator is very very very easy to take out. If it takes you anymore than 10 mins to remove, your doing something wrong

__________________
Marti


Car: C Red S13 Silvia 2.3l 400+rwhp-SOLD
Daily ae82 4age corolla (light mods)-Sold
Daily:SWB GQ Patrol
Will be a 03-04 STI next