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when you turn the ignition key to the on position ,that is what powers up the instrument cluster ! on newer vehicles the ignition 1 relay powers up a lot of systems on the vehicle ! ford has power hold relay that powers up most systems on the vehicle . Go to www.bbbind.com for free wiring diagrams an look for yourself !
This is usually caused by having a vacuum hose come off or connected to the wrong place. The diagram is under the hood. Also the cold air bypass could be dirty and need cleaning. I use carb cleaner in a spray can. Other check air filter, plugs, wires.
I'm sorry, I have to ask, this is an automatic right? That out of the way, Does the trans shift different when you drove it with the Vss unplugged when you had the ohm meter on it? 8.5 volts? Something sounds wrong here. I'll have to look up the wiring diagram before I can say thats a bad reading but it should be battery voltage (14 volts running) or 5 volts?
you need to find yourself a wiring diagram for your vehicle and check the live an earth connections to the instrument cluster using a suitable test probe or vault meter if you unable to locate a wiring diagram try and find a donor car which you can compare the power supplys with