91 Kf laser coolant temp sender/switch?

[srselec]

Hi all my work car 91 KF laser ghia efi 1.8l sohc needs a new coolant temp sender the one thats next to the thermostat..fan is on all the time..
I have ONE wire (black/green stripe)witch connects to to oringal coolant temp sender ,,,When i went to repco or bursons auto stores the one they have listed in their books for my kf has 2 blade connector but i have only one wire ,so im confused,, ford want some stupid price for a new one,,,and would rather buy non genuine ,,,every laser at the local wreakers allready has them pulled out,or they look stuffed,i tried one from a older laser but same problem fan stays on all the time,anyone with this laser who could give some info would be great ,,,thanks for ur time