Gold and Silver on Oanda and hedge/arb

Hello

I'm interested to start arb between the gold and the silver on the oanda. But i don't know how much gold and silver units i have to buy/sell for perfect hedge.

Currently gold costs 910
Currently silver costs 17.5000

So i divide gold price by silver (910/17.5) and i have 52x different.

I bought indicator for the metatrader who, after calculating, shows the silver chart on the gold chart and of course it shows deviations between metals. But there is one problem, I don't know how much units should I buy? I googled and i dont found any informations about this.
 
Just as a side note, oanda's spread for gold is about 50 cents so if you are planning on some quick arbitrage this might not be the best platform.
 
There i see $10 differencies between the gold and the calculated silver on 1m interval so i'm accepting $.50 spread.

So anybody knows how many units should I buy?
 
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