What insulin, dose and schedule?
What diet?
Too much insulin can be fatal very quickly. Too little insulin may result in diabetic ketoacidosis and/or hepatic lipidosis from the breakdown of fat for energy. Both of those conditions are very expensive to treat and potentially fatal.
Home monitoring is absolutely essential for your cat's safety and optimal health. We suggest getting an inexpensive glucometer such as the WalMart ReliOn Confirm, Confirm Micro, or Prime, or purchasing through our shopping link at ADW and getting theArkray USA Glucocard 01 or 01 Mini. Also get matching test strips for the meter and 26-28 gauge lancets to make a tiny prick on theo uter edge of the ear. Practice on an apple and yourself a few times to get a feel for it. Then test on the upper, outer edge of the ear, just between the visible vein and the ear's edge. Many cats tolerate this quite well, especially if a low carb treat is given at each test time.