You will not be able to deduct the deduction for National Insurance from your gross wages for US tax purposes. I assume you are not including it in your gross wages.
It appears that you may be able to deduct your UK pension contributions from your UK wages for US tax purposes. Please see Article 18 US/UK Treaty The Foreign Pension Plan Dilemma for American Expats
Contributions paid by or on behalf of that individual to the pension scheme may be excludable in computing his U.S. taxable income
and
Any benefits accrued under the pension scheme, or contributions made to the pension scheme by or on behalf of the individual’s employer is not treated as part of the employee’s taxable income
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