The ECT gets one of it's two speed signals from the speedometer... if the speedometer is messed up I'd bet the ECT isn't going to behave. The TPS is another thing to check. I'm not sure what switch you refer to , but generally if any of the switches were turning on and off at random you'd have problems. Look at the wiring for the switch (it it's not the gear selection switch) and try bypassing it and going for a short drive.
Is there anything else wrong with the car?
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