What is the percentage that a type 1 diabetic father will pass it on to his children, boy or girl?

About 6-8% This risk applies to both sons and daughters of men with type 1 diabetes.
Hard to say. Inheritance of diabetes type 1 is complicated and multi-factorial- meaning it depends on many things, so its hard to quote an exact risk. The american diabetes association says a father with diabetes has a 1 in 17 chance of passing it on while a mother has a 1 in 25. This risk doubles if the parent developed diabetes before age 11 or if they carry certain genes, such as hla-dr3 or dr4.
1/17. In general, if you are a man with type 1 diabetes, the odds of your child getting diabetes are 1 in 17. If you are a woman with type 1 diabetes and your child was born before you were 25, your child's risk is 1 in 25; if your child was born after you turned 25, your child's risk is 1 in 100 (ada source).