fartskillet

hi yall, heres the lowdown. just swapped my 94 hardbody cab and bed onto a 84 4x4 chassis, engine and drivetrain. the 94 has an electrical speedo, wires coming from the gear that meshes with final drive instead of a cable. how in the hell can i make this work ? tried just hooking up the red wire to red and white to white, nogo. is there some input from eccm also? i cant get the tach towork either. where does it get data from other than the distributor?

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