Under the no.3 intake runner, roughly. I can't remember if you've already got an oil pressure gauge or not - if not you'll need to buy a variable resistance sender as opposed to the on/off unit that'll be in there. The variable resistance one is about the size of a jar of baby food, and the other's much smaller, so not hard to tell them apart
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Proud TQE Operator and President of SEFAG - the Society for the Elimination of Ford Automatic Gearboxes

Pacemaker headers + 2.5" exhaust
EF Fairmont interior
MP3 player
Lowered King springs
5 speed manual
EF motor
Newest mod: EF Ghia wiring loom and dash