97 Challenger Bilge Pump sensor, where to buy?

[jabroni1m]

So my automatic bilge pump isn't being so automatic. It works manually, but not automatically. I'm assuming the sensor is bad but can't find it online anywhere or in the parts fiche. I think thats what its called. Should I just try to find another bilge pump that is similar, or buy a sensor and attach it to the existing pump. Or should I buy a second bilge pump thats automatic and leave them both hooked up, the original up front near the seats and an another pump in the rear where water always seems to stay.