Have replaced this on my 91 300TE with 103 engine and 4 pole engine coolant temp sensor.

The plug has a flattened edge and the holes in it are marked 1 2 3 and 4. However, the sensor has no flattened edge nor markings, nor did the old one removed.

I've plugged it in has it naturally sits, but rough idle for engine. Other than keep turning the plug 90 degrees and driving the car around, anyone alligned up the sensor and plug correctly?

Thanks.