def use the header, and use the 2.5 t-stat housing.. dnt know about compatibility on harnesses, and swapin computers.. can always try... think the fire wall connection is different, but who's to say plugs are/are not pinned different at computer

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1999 MAZDA 2500SE, 2.5L 4-clanger, 5 speed, Green n slow. Rangers as daily drivers since 1988.
ASE Certified Mechanic, Builder of Show Destroying Protouring and Classic cars..