Same advice for the power windows but for the guage. Are you sure that the wire at the bottom of the tach is correctly plug. When i've removed mine for cleaning the glass. The first time i've got the same problem. The needle still in very full position (more than the normal full position) I've push the right large wire plug straight to his position and for me this resolved the problem.
Hope this help
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88 GT, K&N, Home Made Ram Air, Convertible Engine Mount, Dynomax Super Turbo, 180° thermostat, Energy sway bar bushings, Strut tower brace.
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