My $.02
The RCX control unit is a POS. The gauges (mechanical) leak, and there is very little room to mount the control faceplate in the VX. There are far to many "push to connect" junctions, and all of these connections have the potential to become leaks.

The shocks however are excellent for the money. I'd say install the shocks and skip the control unit. Set the firmness to your liking, and drive leak-free.

That said, I bought my 9000s (and control unit) from Sam's Offroad for @$400 (a month ago). I am currently machining replacement manifolds for the air control, using as much hardline as possible and eliminating leaks at the control unit by going to electronic senders and remote solenoid valve operation for the relief. If you don't want to go through all of this trouble (I'm making most of this myself, out of spare parts), be prepared to push that little red button every morning.

IIRC, you had some Q's about installing some driving lights by yourself, if those lights were beyond your mechanical abilities, I recommend that you have a mechanic do the shocks. It took me less than an hour to change all 4, (before running all of the plumbing for the control unit), so your mechanic shouldn't be killing you with labor costs.

Don't be discouraged that members are hesitant to give you step-by-step instructions on how to do most things. That's a lot of typing, and it's really not the purpose of this (or any) forum. It's kinda like explaining how to play poker over the phone -If I'm not standing there with you, it's gonna take forever. If it's something that you'd like to learn, start small (like Maugan VX's oil change example) and work your way up. Get a manual and some tools and have a day. If it's just a bolt-on part or two every som often, find a good and reasonable mechanic and let them do the grunt work.