As you know, The new API 5B Specification (16th Edition) has already been published in December, 2017. The effective date of this edition is July 1, 2018. You need to meet the conformity requirement prior to that.
The 16th Edition has made some major changes. Since its publication, Gagemaker and us have gone through the specification to find out the changes and new requirements. Now we have compiled these changes into a single document. In it you will find very specific comments, guidance & recommendation of gages. You can download the PDF file here:
New Requirements from API 5B (16th Edition).pdf
Hope the information will be helpful for your job.
Should you require any further clarification or assistance, please just feel free to contact us.