Hello, newcomer here. My names Jim, I'm based in the North West of England, I have a narrowboat called Sin Prisa. It's an unusual name and means 'No Hurry' in Spanish, I was thinking of changing the name but it's grown on me and I like its originality. I purchased the boat in 2019, it needs a lot of work doing to it and as I was new to narrowboats at the time I'm having to learn much about boats such as the DC electrics, the engine etc... Btw, my engine is a Lister SR2 with a LH150 reversing gear. Now for my first request for help, I hope this is an appropriate place to post this. Please have a look at the included photos. I'm wondering what this actually is and where it connects to, the second photo shows the disconnected pipe. Research suggests it's a pressure gauge. I'm also not sure what the tap to the right is for, it seems to release oil. Thanks in advance for any help anyone can give.