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If the trailer doesn't extend past the transom there would be no need to remove them. If it does, then I don't think trim tabs would work out well unless you like getting wet.

If tilting doesn't help could you "extend" the current bracket somehow without removing it from the transom?

That works out well then! It will be a good starting point.

I've never had a problem with either fixed or smart tabs.

Is the transducer on a bracket that's attached to the transom? If so, can you remove the transducer without leaving exposed holes? Then you could mount the transducer in the bilge if it's fiberglass.

Is this a mechanical gauge? Without starting an oil debate why not try it with a recommended weight which is 25W40.

The plug might be exposed but how would UV rays reach the 5200? I wouldn't worry about it.

Here's a link to an online owners manual. If it's not available you can order a hard copy. https://www.mercurymarine.com/en/us/land/owners-manuals/

I can only guess that the transducer is for a depth finder. If so, and you know the make and model, you should be able to get a new transducer.

Does it sound like the pump is working when it won't tilt up? Have you tried using the tilt switch on the motor when this happens?

Look on the back of the gauge. If there's a small rubber hose going into it then it's a pitot tube gauge. The hose attaches to either the motor leg or a fixed pitot tube pickup on the transom. What motor do you have?

In the meantime, try letting it idle for a minute before shutting it down.

I'd try a Mercury 14.25x19.

Have you checked with a starter/alternator rebuild shop to see about getting it fixed?

Welcome, If it came standard with a bilge pump or not a lot of things could be added, discarded or broken in 37 years. You'll have to look around to be sure.

Trim tabs won't help at idle speed.

There used to be a pictorial showing the differences but did you see this?

This type would be easy to install. https://www.iboats.com/shop/beckson-drain-plug-1in-black.html

There's also Breezeworks that offers a kit.

Check to see if the motor is getting voltage when you operate up and down. If it is, take it apart to check the brushes.