NEED HELP! wiring add-on gauges

I am looking to wire up some short sweep electrical gauges. I have tees and new sending units for the new gauges.

I want to keep the factory clulster working and just tee off and have the new gauges run as well. (OIL PRESS,VOLT,TEMP) My question is do i need 3 seperate supply (+12) lines, or is there someway i can piggyback the 3 to one circuit in fuse box. any ideas best place to connect in fuse box?

i dont want to run any mechanical gauges, just add 3 elect. (dont like the idea of hot oil running through the int. cooper pipe or not.. lol)
thanks for any help guys