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Jump the plug of the low side switch. That way low side isn't seeing too low of a pressure and preventing compressor from engaging.
I've never done what you are attempting, I'd say grab a can or two of over the counter stuff but you are r12 so that won't work. If the low side switch is bypassed, you shouldn't have to worry about having enough psi to fool system and you won't have to worry about high side hitting cutoff obviously.
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