Wiring new switches means by passing the original switch. If orginal switch has an indicator lamp you can use it as indicator pilot lamp or just leave dead & add a switch or replace altogether. I added a new switch beside original using old switch as a pilot light because I couldn't find lighted double switch the same size. (Im also thinking now a switch w/light wouldnt work-since its on/on, even though second switch turns on/off power to pump the light would always have power, hmmm use a lamp ) I got cheap toggle switches from local auto parts. Small green led pilot from radi shack. Mounted second switch in bath under sink-see pic. You gotta open the door anyway. Our main kitchen pump switch is in wall, a lot are in range hood, getting wires to bath may be a bit of a challange
As to having the second bath pilot on all the time as a nite lite, (not showing switch position) I don't think can be done using this method, because this is a switched circuit & myself I wouldnt want the batterry drain. However when pump is on you have light. (More on lights as seperate subject below)
1. Turn all off power or breaker for pump, (note at some point you need to determine which is the hot 12v in wire in old switch)
2. My original pump on/off switch had 3 terminals, 12v in/, out to pump and ground for pilot light. At old switch, unplug hot 12v in source and run to new switch location. Unplug existing wire that went to pump and plug into 12v in position on old switch you just cleared (or new lamp). Org switch ground remains (or use to ground new lamp). Switch will now be only a pilot. [option, If replacing old non-pilot switch with a pilot lamp run existing hot to new switch, use old wire that went to pump as source for lamp (this will become hot once all wiring is done), ground lamp]
3. New kitchen switch, connect existing hot 12v from old switch and connect to in position (center) - run 2 new wires out to bath switch area from both out terminals-(note 2 wires between the 2 switches dont need to be color coded, it doenst matter)
4. In bath you now have 2 new wires from new kitchen switch , new pilot lamp and new 3 way switch (same as new one in kitchen). connect the 2 new wires to the out terminals (same as other switch). From the In (center) run a new wire to lamp then to pump location. Run a ground from the lamp (i had to run all the way to the kitchen for ground, there was nothing to ground to under sink) I used a standard wall switch plate to mount new switch and pilot in bath.
5. At the water pump, the wire that was 12v feed coming from old switch is now going to power old (or new) pilot in kitchen. Splice new wire from bath switch into this wire, leaving the orginal wire connected to pump. (As far as the pump is concerend , nothing changed-power is coming from the same wire)
Your done!
I know in trying to describe this it's probably confusing, but its really simple. And obviously yours will be a bit different. Hopefully sketch will clarify and this helps you out...
Mark
Nite lights: I generally turn on the vent hood light at nite, its the least obtrusive while snacking @ 3 in the morning. But at some point small lights would be nice. I'm thinking small leds, single bulb pilot lights, or simpler would be some cheap automotive 12v rocker switches. They could be added to existing fixtures or about anywhere, even though they wont control anything, turning them on activates the pilot. The green color seems to be easier to see by, ... I seen someone used the small round hooded license plate type lights. They'd be great for some soft lighting-an option but I'm looking at minimal current draw. Thinking out loud, just some thoughts in passing. I only mention cause might be a good time while your in there to add seprate hot lead for a nite light.