The mounting tab is simply the small metal part the valve mounts to, so you can mount IT, somewhere off a single bolt, to hold it in place.
The valve is a tire (Schrader) valve, with the same, red plastic lined inserts in a "T" fitting, to accept 2 lines into one unit.
The shockes have such small volume, you need a small, "No loss" pump. Even using a standard tire guage will cause you to lose 3-4 lbs. HD sells a pump with an integral guage for $50. Progressive sells one too for less. You may be able to find one in a bicycle store, with a guage, for about $25 or so. Guage has to be a "No loss" so no air is lost upon taking the pump off.
If the shocks are off a 1999 RK, they hold 35 MAX psi.
I run mine (235 lbs) at 15 lbs for just me and 25-28 with the wife on.
“When the going gets weird, the weird turn professional....” ~ Hunter S. Thompson~
R.I.P. Rubberdown. 1971-2012
"Your Jedi Mind tricks will not work on me...... ~Misinlink-2016~
2005 E.G. Classic
S&S 510 cams
Baisley Oil pump spring
SE 3.5" pipes
S&S adj pushrods