I had a old V series attwood bilge pump on a boat that i just bought like a few weeks ago. Never been in the water yet. I just bought a tsunami t800 bilge pump as a replacement for the V625 one. My question is can the bilge pump just work without the bilge pump because i couldnt find the old one on the boat or it didnt had one. Does matter with the float switch or no? Can i just run it only by the pump it self?