I would go with the harness. If you bypass the low pressure switch, you could ruin the compressor if the freon gets low. Plus, you want it to work when in the defrost mode too.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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