Oil Leak

[R338OY]

Here's a pic of my oil filter and something next to it (what is that part?) There's some oil leaking from my car every day when i move it from the garage. I looked for where the leak is coming from and couldn't find anything anywhere above or below the motor. Then i ran my fingers underneath the oil filter and that copper coloured cylinder next to it, both had fresh oil on them.

Should i fix this immediately? Can i do anything in the mean time?

Cheers

[QWK32]

i think thats the oil pressure sender.