SoFresh1189

i recently bought a triple gauge pod for the pillar and im hooking it all up now, ive got a tach, air/fuel, and vacuum gauge, and i was wondering would it be ok if i splice all the ground wires into one wire and ground them all together or should i do them all seperate? same for the ignition as well can i do all those to one fuse and if so should i put a higher amperage fuse in?