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If you were to look in the wrecking yards, some small blocks are equipped with the T fitting already for computer aplications. Grab one of them, then get a dummy light sending unit and a fitting for the guage on the other end of the T. The sending unit (dummy light one) will ground out the light when the oil goes below 'X' psi, so you'll need power at the light, and it'll be grounded when you run out of oil.
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