- The RPM sensor wire has a black square at the end of it and comes with a black plastic mounting bracket. A magnet in the flywheel triggers the sensor. The Revo uses the long version (TRA6520).
- The 6521 (long) harness uses a simple loop around the head of the engine to read temperature and a jumper wire (red with a shrink wrapped resistor) to complete a voltage sensing circuit.
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