What you quoted was correct (in 3.1). Tailoring got buffed with the other professions, now it is worth about ~130 AP over time while losing 22 Agility (worth about 30 AP for me). So tailoring would give you a 100 AP gain while the other AP professions give 80 AP.

Thought I would post some updated numbers for engineering bonuses.

Boot enchant - 24 crit rating + 5 second speed boost every 3 mins
Cloak enchant - 23 agi + parachute every 30 seconds
Gloves - 340 haste for 12 seconds every minute or 1654-2020 rocket dmg every 45 seconds (this can crit more on this below)
Saronite bombs - a bomb you can toss every minute

So first the boots.

crit rating is currently worth 0.91~ dps in my current gear while ap is worth 0.716 dps.
0.91~*24=21.9
0.716*32=22.912

basically it's so close you might as well use the engineering boots if you're above hit cap since the speed boost can be quite handy on some fights (yogg saron especially if you get a bad fear or brain link)

The cloak next

in my current gear agility comes out a tiny bit better than haste and this cloak enchant gives 1 agility above the current best agility cloak enchant so it's a straight win... although a tiny one. Agility is worth about 0.9 so it nearly balances out losing the 1 dps above to take the rocket boots.

Gloves
The choice here is a haste use effect or a single shot dmg use.
haste is currently worth for me 0.796~ dps, the use effect is worth (340*12)/60 = 68
so the hyperspeed accelerator is worth 54.128, however this does account for the fact that every other use of this effect can be used with avenging wrath which increase it's effectiveness by 20% when used. So to work that out we can take half of the current dps granted and then add 20% of that value to the original figure.
54.128/2 = 27.064, 20% of which is 5.4128, making the final value of the accelerator assuming you use it with avenging wrath when ever possible is
59.5408, this however doesn't account for trinket procs etc happening while under the haste effect so the worth is a bit higher on average. This is 28 dp over the crusher enchant

The rocket however does (without crits) an average of 1837 dmg every 45 seconds, this is 40.82 dps. However it can crit. The data on this is very conflicting, it certainly has a pretty strong crit rate however. The crits seem to be doing 150% dmg. So taking a crit rate of 50% would add around another 10 dps to that figure. However there's definate evidence that it has some scaling with some buffs/stats, ie, it hits non-crit for higher than 2020 for me.
Rawr is listing it as 68 dps right now, so i'm assuming this is modelling based on it being affected by all % dmg modifiers at least which would make sense as we have 6-9% modification on all damage with an aura up and from crusader and a 6% increase would correlate with the top end non-crit hits i was getting tonight while testing.

Anyway assuming all the scaling assumptions are correct the pyro rocket is worth 68 dps according to rawr which is 37dps over the crusher enchant.

And finally the lesser known benefit

Saronite bombs
These work out to 22 dps used once per minute if you get no crits. You can fit them in within a global cooldown if you're fast losing no dps time to make use of them netting the full 22 dps bonus. They are also aoe which has an impact for fights such as mimiron or thorim and so on. They are instant cast btw so easy to slip into rotation or use while on the move. It also does not reset swing timer.

The above puts engineering at around a 59dps increase for ret paladin. 2 bold cardinal rubies from blacksmithing does come out to around 73dps however so it;s not an optimal choice.

However the intriguing part of the rocket and bombs is they do all their dmg in a front loaded fashion whereas stat based increases are based upon constant attacking (ie. anything that upsets your cycle such as using sacrifice wastes a tiny portion of your stat bonus in effect along with the normal penalty associated with stopping to use support skills). This leads to them being very reliable increases in damage, especially since they are ranged and suffer little to no restrictions on use (they are not spells so you cannot be silenced and prevented from using them).

It's all rather situational and so on, but there are some very interesting merit for engineering with the utilities offered along with a very respectable dps benefit that isn't much behind the stronger stat professions.

Anyway I thought a more full inclusion might be useful as there alot of engineers who enjoy alot of the perks and prefer to keep it rather than changing to something offering a little more dps so would also aim to get the most out of the profession to limit that loss to justify the other perks like jeeves .

You can get a refund in two hours, that should be enough time to test.