Yes. I was getting a little confused about what he was saying about the arrow light.

On my '92 automatic when the arrow lights up it is pointing upwards.

This means it is telling you that up can shift up into fourth, if you push the button to release the relay. It is keeping it from shifting up into fourth or the overdrive gear on purpose!

It is intended to be use on grades going either up or down.

Going down hill it will hold back the car so you don't have to use your brakes so much. This saves rotors from overheating and the pads from fading out in case you really need them to stop you.

Going up hill it keeps the transmission from shifting up and down, if you are running at a speed at which, the engine keeps losing momentum and torque to pull steadily.

With this said, it is something that you should not want to bypass mostly because down hill safety and up hill repetitive shifting.
The going up hill, work of the torque converter, gets the oil hot enough.

Going up hill requires torque over brake horsepower. Or actual Draw Bar horsepower, which is, actual pulling power of a steady pull and not a "dropped load snatch" to a near stall or stall of an engine.
Brake horsepower is still a sales gimmick. A number derived from moving a load, one foot in one second. In the old days, the brake horsepower number was specified "@ the rear wheels!"

Today, that has slipped from manuals and sales brochures.
Just like lawnmower engines are rated twice that of an electric motor equilivent or your vacuum cleaner is rated up onto the gas engines horsepower.
An electric motor, the size of fist, peaks out a 4.5 horsepower. All a lie! Sales again!

With horses or "A" true horsepower of work done, that's put is correct in relationships, to most anything else used, you want to go farther than that!
Draw bar are old time accurate specifications but are a far smaller number and did not look impressive to customers in a two place whole number and some tenths.

Now a farmer and his tractor knew the difference.
Their engines make like 35 hp @ a few thousand RPM. But getting it down out to those large rear wheels is a whole new reality.
They can put, 200+ hp Jeeps, to shame getting them out of their holes!

That is why you see large cubic inch engines pulling at lower RPM's and little engine screaming to bring up their torque bands up where their horsepower is developed with short stroke engines.

I know that this seems all irrelevant, but think again, why did Volvo put in the overdrive and also put in a relay and switch!

Better for engine and transmission, I'd say, leave it working.
IMHO

Phil