I know they changed them around from year-to-year, and I don't even have a Prelude....

On both our '95 Integra and '98 Accord, the one on the thermostat housing (lower radiator hose), is the fan switch. It'll either read open (cold) or short (hot). The ECT sensor looks the same, but it's on the nozzle for the UPPER radiator hose.