This is on the front of the motor, kinda above/behind the A/C pump.
the stock sender is has a black plastic cap on it and a stud sticking out of it to which a single wire attaches. The easiest access is going to be to remove the belt, then the three bolts that hold the A/C pump in place, and then tie the pump out of the way so you can get access from below.
What you see in the picture is mine accessed from the top, but the heads were not on the motor at the time either.
If I remember corrctly Accusump makes accumulators in 1, 2, and 3 quart sizes, Moroso does 1.5 or 3 quart. I went with the 1.5 Moroso. My reasons follow:
1. Moroso are more widely availiable (Summit, Jegs, a local shop, etc...) (in my experience)
2. I had discounts through Summit, due to recent other purchases.
3. Even WITHOUT discounts, the Moroso and needed parts (through Summit) were close to the same price as the Accusump kit (through BAT), and the Moroso is .5qt larger.
I have my complete price break down (before discounts)in a later post further down the thread I link to you previously.
