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I have a 1979 22' Revenge and I believe we both have the smirked hull. Variations in the cabin and transom. I installed three bilge pumps. I do not understand the "center of the deck bilge" comment. You may be referring to the fish locker. One of my pumps is located in the splash well, another in the rigging tunnel by the transom, the third on the cabin floor. Automatic bilges usually have 3 wires (in some instances the pump will have two wires, black and ?, with a float switch installed independent and wired to the pump). With the three wire bilge pump usually one black (negative), one brown and the other brown with a white stripe. Those two brown wires go to a three way switch. Off, on (pump activates with the water level detector), manual over ride (where you flip the switch manually to activate the pump). You do need a fuse before the switch (or circuit breaker switch) for each pump. I put in an additional (my service to the bilge pumps is a dedicated line) 40 amp breaker between my battery and the fuse/switch assembly. Do check the amp rating of the pumps because it will tell you the fusing and wire gauge for length of run. They do draw some juice......I believe around 10 amps plus each but that is a guess unless I check out my boats panel/wiring.

My fish locker and rigging tunnel are magnets for water. I installed a brass through pipe from the fish locker to the splash well (water removed with splash well pump). Do check the installation of your pumps. I use Boat Life Life Seal as a seal/adhesive attaching pumps to the floor and my discharge hoses are installed so as the flex of the hose wants to keep the pumps in place. If the previous owner screwed the pumps to the floor it should be investigated. That is a very thin shell right there and it may need sealing/repair right there to prevent water intrusion. If you bilge pump is in the fish locker........how was it wired and how does it discharge? Not a lot of access to that area on my hull.

Garris

edit: Looks like Jortva and I were typing at the same time. I would like to add that the discharge hose (especially on bilge pumps with a long length of hose above them) need a backflow preventer. Hose water will keep recycling the pump. My lowest pump (without the backflow device) in the cabin seized up before the battery was drained before I found this out.