If you want to run those three things, you'll need 3 senders. It's worth noting that the ECU is capable of PWM fan control; all Corvettes have had it since 05. I have this set up with an LS7 in a '68 Camaro. I also use an A/C pressure sensor for the computer to run the fans for that. Without going into too much detail, you'd need the PWM module from a Corvette to make it work and be able to set, or have somebody set, the computer to work it.
As to the third location for a sender, I used the block drain above the starter, but haven't had great success getting accurate readings. It's good until the engine is warm, then it keeps going an extra 20-30* from the ambient heat down there. It could be that the adapter I've used for the sender has it too far out of the water flow to read right, but I haven't tried to fix it yet. Basically buyer beware on using there to read.
Another option I've see is drilling and tapping the water pump by the thermostat, IIRC. I've never tried it, so no first hand experience there.
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