The gauges are thermal electric by design. They rely on regulated voltage from the voltage regulator (usually located on the cluster board). The regulated voltage should be between 4-7 volts DC. The sending units provide a point of resistance that varies with fuel level or coolant temperature. The resistance value of the sending units (fuel or temp) will cause the respective gauge to move the pointer up onto the gauge (from left to right) to the corresponding reading on the gauge. Without voltage to the gauges, the gauge pointers will normally rest to the left or on the E for fuel and the C for the temperature gauge. Disconnect the temp sending unit wire from the temperature sending unit on the engine (purple or pink wire?). Turn the key to the ON position and measure the voltage at the disconnected connector female terminal end with a DVOM on the 20volt DC scale. Red DVOM lead inside the female connector and black lead to the battery negative terminal. The DVOM should read an average voltage of approximately 6 volts DC. Hope this helps. Let me know what happens. Good Luck. Dutch