There isn't a single universal firing order diagram for all 1987 Dodge Dakota engines.
To find the correct firing order, you need to:
1. Identify your engine's displacement: Look for an engine code or sticker under the hood or in the owner's manual.
2. Consult a repair manual specific to your engine: A Haynes or Chilton manual for your specific year and engine will have the firing order and a diagram showing the spark plug locations. You can also find this information online through a reputable automotive repair website, but be sure to double check that the information matches your exact engine code.
Once you know your engine size, I can help you find the firing order if you provide that information.