Getting a table through a function

--SteamPunk_Devil's Tank Monitor!
print("SteamPunk_Devil's Tank Monitor V0.01")
os.loadAPI("API/steAmPI")

local tank = peripheral.wrap("back")
tankData = tankInfo(tank)
print(tankData[1])

--steAmPI By SteamPunk_Devil IGN - SteamPunk_Angel--
--Feel free to edit this in anyway as long as you credit me(and tell me if you can)--
--Initials: SPD = SteamPunk_Devil,

print("Successfully Loaded steAmPI, Version: Indev V0.01, By: SPD, Release Date: 28/02/2014") --Change release date and version every full release, The "By" is the initials of whoever release it and full names can be found in the header

function version() --Displays version
print("Indev V0.01, By SPD, Release Date: 28/02/2014") --Same as above
end

function tankInfo(tank) -- Getting info from RC tanks
tableInfo = tank.getTankInfo("unknown")
return tableInfo
end

function Percentage(current,total) --returns One number as a percentage of the second one --TBD Round to a Decimal place
local No1 = current
local No2 = total
local Percent = (current / total) * 100
return Percent
end

function Buckets(miliBuckets) -- turns milibuckets to buckets
local total = miliBuckets / 1000
return total
end