Get a volt/ohm meter and check the resistance accross the coolant temp sensor. It should be between 200-400 ohms after engine is warmed up. If it reads OK then you will probably have to meter the wires from the plug to the ECU.
If the oil guage is broke its probably the guage. Ive been driving without mine for about 3 years now, dealer here can't get it even from Japan.
Single wire sender is for the temp guage if its down the right side below the thermostat housing. Its only for the guage.
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