GP doesn’t send the cents offset, but you can convert the tuning value (which is between 0.0 and 1.0) into the cents offset by using TouchOSC’s scripting.
GP-iPad with Cents.tosc (5.9 KB)
function onReceiveOSC(message, connections)
local value = message[2][1].value
local cents = math.floor((value*100-50)+0.5)
local centsText = tostring(cents)
if cents > 0 then centsText = "+" .. centsText end
self.values.text = centsText
end