I've got a simple 3-wire sensor circuit that I need to check. It's a Fuel Tank Pressure Sensor and all it has is a 5V Reference Wire, Ground Wire, and Signal Wire. The signal wire sends a variable voltage signal between ranging from 0.1 to 4.9 volts to the PCM depending on what the fuel tank pressure is. Can I back probe the signal wire at the sensor with an incandescent test light? The plan is to put a T-pin in back of the connector where the signal wire enters the sensor and check it for voltage with a test light. Obviously, I'm not going to get a voltage reading with a test light, but at least I can tell if the signal wire still has continuity from the sensor all the way up to the PCM if the test light illuminates. DTC P0452 is the stored code. (Fuel Tank Pressure Sensor Circuit Low Voltage).