I am installing an oil pressure gauge and water temp gauge where can i drill to get them through to the engine compartment??

nothing on passenger side, only can see through on drivers side. I'm putting them in the center ac vents.
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93-LX: 5 Speed, Flow's with H-Pipe, 3.73's, C&L 76MM Kit, Sub's and K&N.
14.85 @95.83