What Mogs is saying is that a cat without diabetes normally has a BSL reading of between 2.8 mmol/l and 6.7 mmol/l. Until Max is regulated his BSL will probably run higher.
Do you have a hypo kit ready in case you need it? Put a small jar honey in it, some tins of medium carb and high carb food and some extra test strips in case you run out.
Very important! Most of us print off the following directions telling you what to do with low numbers/hypo and put it on the frig for future reference. If Max drops low you need to know what to do straight away, not have to go looking for information in what to do. Because you are testing the BSL you will know what his BSL is and be able to be in control. Here is the link to what to do if you get a hypo
http://www.felinediabetes.com/FDMB/threads/how-to-treat-hypos-they-can-kill-print-this-out.15887/
What insulin and dose is Max on?