225ci v6 is covered in the 1966 Chassis Manual
https://www.teambuick.com/reference/...files/60-a.php
wiring loom diagrams are here
https://www.teambuick.com/reference/...20-i-color.php
oil systems are covered at pages 60-13 and 60-31. stock location for the idiot light is in the timing cover and i think that's where the factory puts the pressure sender as well.
if you're putting a REAL gauge in, that's not where you want the sender to be though. you want the sending unit plumbed into the one of the oil galleys at the REAR of the block. you wipe out the #2 main bearing and oil pressure at the timing cover might still look okayish ... but nothing at the rear of the engine is getting lubed. that will destroy the engine.
http://www.buickperformanceclub.com/Oilmods.htm
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