Leaking from the gauge - Krups Stainless Steel Electric Kettle Electric Kettle

The most common problem is low Freon levels. There is a low pressure switch which can be bypassed for testing, to see if the compressor clutch will engage or not.
You will need a pressure gauge later on, and some refill cans have built in gauges which come with them. The better way to do this is using proper gauges called "Manifold" gauges. Some may be borrowed from major autoparts stores.
The rule of thumb is that the system should not be contaminated with outside air containing moisture. A low pressure condition may be Restored by adding Freon with leak stop. But an empty system needs to be Vacuum pumped to eliminate moisture. A badly drained system may need compressor oil too.
Leak stop can help some systems, especially if the leak is on the low pressure side. There are gauges called sniffers, which can detect a leak. There are also chemical leak detectors for about $20 having ultraviolet light and glowing detector dye.
While this all may sound vague, it amounts to having a small leak that can be helped with leak stop and catching the problem before the system is completely drained. Every case is different.
Figure that you do not know when the leak started. If it was 5 years ago to run empty is different than 5 weeks or 5 days to lose all the Freon. The smaller the leak, the better chance that stop leak will repair it.
There are some CD's at Autoparts stores which will explain the repair process.
Also take into account that some techniques discussed in earlier times used $3 cans of Freon for testing. Today each can costs $7 to $17 and a car uses 3 or more cans for a refill.
So bypass the low pressure switch with a wire loop, then use leak detector with a leak stop before topping off the system. Look for leaks. If none are found, use the gauges and add Freon.
If you suspect the Low pressure switch is bad, then it is easily replaced without discharging the system.
I hope my info helps you.

Yes the oil pressure sending unit sounds like its bad they go bad from time to time the oil leak gives it away

the pressure bypass valve in the oil pump leaking by and not closing completely to make the pump build full pressure,or the pump is working and the sending unit is giving you a false reading,then you should have a mechanic put on a gauge to see actual pressure of the pump,don't wait cause if pressure is actually that low you will sustain engine damage soon

First of all you have a bad heater core that needs to be replaced. Second you may have a bad temperature sensor. Make sure the radiator if full of water

Change your fuses your fusebox probably got wet when you had the water leak or if your unlucky it could be a problem with the cars computer but i think they are usually on the passenger side so probably not

There'a s a rainwater collecting vessel just above the back of your dash board instruments where the wires and connectors are. The vessel might be already corroded and leaking. The leaking water short circuited your connections. Check all the fuses and look for the source of leak then fix it.

It's probably the pressure gauge.. before you replace it, put it in some water to see where the leak is actually coming from. If it's coming from inside the gauge housing, it's time to replace it. If it's from where the hose is connected, there's a little spindle inside the connector between the gauge and the high pressure hose. Those frequently get corroded and start leaking. It's a cheap little metal tube with an O-ring on each end - those get brittle, crack and leak... the spindle is a cheap part at your local dive shop.

isw this leak inside car or outside ,yellow fluid sounds like antifreeze