I am brewing a scotch ale currently and haven't been able to determine how many volumes of co2 that it should have? also, what pressure should I put the beer under to carbonate to that many volumes. thanks in advance.
Not sure if you mean Scottish Heavy 70/- or Strong Scotch ale, but start around 2 volumes and go from there.
The amount of pressure depends on what temperature the beer is in the kegerator. Cold beer will hold more carbonation at a given pressure than warm beer. You need to consult a carbonation table like this one: http://brewery.org/library/CO2charts.html
Hope that helps