Richard 1992 SC400

I recently purchased a 1992 SC400. Can you help me identify two parts in the engine area? Attached are a few pictures. The first part is located between the A/C compressor clutch and the main engine flywheel. It sticks out of the front of the engine. It has a single wire coming out from a black boot. Something is leaking out of the boot onto the A/C compressor clutch, so I would like to replace it. The second part sits in the back of the engine compartment near the brake master cylinder. It says Nitrogen Gas Under High Pressure. What is it, and what does it do? Thanks very much for your help. Richard

I recently purchased a 1992 SC400. Can anyone help me identify these two parts? The first part sticks out of the front of the engine between the A/C compressor clutch and the main engine pulley. It has a single wire coming out of it that leads to a connector. Something in the part is leaking on the A/C compressor clutch, and I would like to replace it, but I do not know what it is. The second item is a canister that sits near the brake fluid reservoir and it says Nitrogen Gas Under High Pressure. What is it, and what does it do? Attached are a few pictures. Thanks for your help.