You Do Need power plug adapter while traveling from Ireland (Eire) to Senegal.

Here is Why You Need An Adapter

The outlet and plug type used in Senegal are C, D, E and K and in Ireland (Eire) is G. This is how they look like.

Ireland (Eire)

In Ireland (Eire), outlets of type G are in use.

Type G

Senegal

In Senegal, outlets of type C, D, E and K are in use.

Type C

Type D

Type E

Type K