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most sensors and electronic devices on the engine run off of a range of specified voltages, some simpler sensors don't care as much if the wires are extended and resistance is increased within reason (the intake air temp sensor - a thermometer comes to mind). The TPS I wouldn't be splicing and adding wires to test where it is. Remember every sensor on the engine is registered in tables in the ECU, this means that somewhere out there is a product that will allow you to read those sensors off the OBDII port without changing any sensor wiring. Some are very expensive (tuning software), some like the scan gauge may read your TPS around 100-150$. There may even be cheaper alternatives.
x2 on the vacuum gauge.
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