Good evening - the sender and sub sender have gone bad. Ordered the Dorman replacements and a Delphi fuel pump (sender is attached). Vehicle has 145,000 miles. Paying a mechanic on the side $30 / hour to fix. Thoughts on this - should he just replace the senders ($40 in parts) and return the Delphi pump - saves $230 due to the return OR have him replace the whole side A because he is already in there and the sub sender . Part total becomes $270 plus labor vs $40 plus labor. Thoughts?