Decide whether you need a strong toasted-sesame aroma (finishing oil) or a sesame-like nutty base (sauce/dressing).
Pick the closest option from the list and swap using the ratio in the table (start slightly low for strong oils).
If using tahini, thin with water to a pourable consistency before mixing into your sauce or dressing.
For seed-based swaps (olive/peanut/walnut + sesame seeds), toast seeds briefly and stir in right before serving.
Taste and adjust: add a few drops more for aroma, or add a splash of neutral liquid (water/vinegar) to balance richness.