Temp sender unit for the ECU. This unit tells the ECU the engine temp only, not for gauge. This is the one in the front of your intake manifold. Recommended to keep your engine working at it’s optimum. Follow the test procedures and replace it as necessary, or just buy a new one and not worry about it.
(years shown are approx only, check the connector shape)
for 1984-1988 (square connector, upper pic)
for 1989-1995 (rounded connector, lower)
CHECK THE SHAPE OF YOUR CONNECTOR before you order