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That is the dealer-installed aftermarket A/C compressor.

My '72 had the same type, it's a York a/c. You have to pull just about all of that off to replace the fuel pump. The smaller round thing above your circle is the fuel pump.

The York compressor is very heavy and as @siteunseen mentioned, the compressor mounting bracket makes it very difficult to change the fuel pump. I had the same set-up installed on my '71 a few months after buying it. But, year later, removed it all and replaced with a modern rotary compressor and mount. I still have my York installation instructions and compressor mounting bracket on a shelf.

I've looked at LED headlights off and on over the past few years. But honestly I don't really see a need for it. LED's are great for saving power in a house, boat, or RV. However, for a car that is NOT designed to run LED headlights, you really need to do it right. And, this won't be a $100 option. I've seen cars running around with cheap LED's and the flicker / light output is too annoying for my blood. A proper LED setup will need new drivers (circuit boards), relays, quality bulbs, and some nice wiring. The right setup also won't require cutting your existing harness and it will provide quality output. When I dug further into this venture, I found the Marimoto setup looks like a good one. But you're talking about $400-$600 for the bulbs plus another hundred or so for the wiring. Something to ponder anyway... FWIW

Of course, there is one other possibility. I could have designed the test wrong. I dug out a diode that should be the same spec as the ones used in the plug and tested myself. I found my instructions were lacking. You should re-test with the meter in diode testing mode. You can leave the key in OFF, too. If you test from the ballast resistor to the white/black wire, you should get a result similar to this: With the leads swapped, you should see this: If you do the voltage test, you should see a little less than battery voltage as the diode causes a slight voltage drop.

Steve won’t get notified on the forum if you don’t use the “@“ before the user name. In this case it’s “@SteveJ”. Just a heads up when you are replying to a certain member with a message or response.

@siteunseen Our Resident Librarian can dig this thread up for you. Have seen it many times here. Sorry Cliff, Figured you were bored on a Sunday afternoon! 🍻🌭

The upper perforations are for the vent, the lower ones are for the speaker.

Awesome.

Update for all of you. We very may be in business here and you were all right - the hydraulic line was crooked/not fully seated and once I took it out and reseated it, the leak was gone. Again, I still don't understand how it didn't leak over the course of 6 years and thousands of miles, but I guess that was a good thing. I am going to bleed the brakes tomorrow just to be safe but I did bleed the master after all of this and the pedal feels good. Here are pictures of the line screwed in before, the flange/nut's condition when I took it out this evening, and how the cylinder looks now with the line in straight.