Behind the battery, there is a plastic cover which you need to remove.
From the photo, you can see the OVP is the relay with the red top (and 2 fuses located at the top of it under a flip cover).
Your OVP may also be with a black top (with only 1 fuse on top) if it is the older model. The red one is an updated version.
To the left of the OVP, you will find 2 black relays. The one closer to you is the Fuel Pump Relay.
In my photo, it is the one located behind the wire loom with the words in white still clear (coz I just swapped it a couple of months ago).
It's definitely the same in your car coz mine is also a 1.8 RHD.
Hope it's helpful.
Babybenz 1991 190e 1.8