the one at the front to the left of the crank angle sensor is your oil pressure switch, you can t peice into that if you want but its easier to just undo the plug at the back of the block

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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