[lxndr]

The one in my spare '87 D16A1 head only says "5E", I don't think this is the part number. I can't get close enough to the one in my '89 head to see what it says.

When I replaced my TW sensor, no one had a clue what I was talking about until I called it a "coolant temp sensor", then described it as the sensor that sends the coolant temp signal to the ECU. Moments later I handed them $35 (USD) and was walking out the door with the part I needed.