If your van has the PTO blunt-cut wires, VSS is one of those wires. This is post-PCM, so you won't have to worry about interference. The PTO blunt-cut wires are tucked into the windshield cowling wire loom, approximately above the brake booster or behind/above the coolant bottle. Near these wire you should also find a 4-pin round connector. This is a pass-through into the cab, where you can connect to a square connector at the other end near the steering column. Ford sells pigtails called aftermarket up-fitter connectors.
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2000 E450 dually V10 wagon
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