Salafis consider deobandis to be the closest to the sunnah, they advocate studying fiqh with them, working with them in common good, no problems praying in their masajid, sending your children to their islamic schools, doing projects such as mosques, charity, dawah etc togrther, when teaching your theological views, advoiding any type of name calling or mentioning deobandi faults (basically teaching what you hold to be the truth instead of teaching what erors you believe others are upon) etc etc.