Anything WPC/WPCs/WPC95 etc (So Williams/Bally from 1991-1998) people seem to always find a way of using a pre-existing connector on one of the boards to power their mods (usually J117,J118 or J119).
Only recently have I had a problem with my Stern machine (Whitestar so not sure if this problem is fixed with SAM or SPIKE) where modders all seem to want to use that 1 spare auxiliary connector near the coin door, so I had to buy a power tap as I want to hook up speaker lights, a topper etc and possibly more in the future. No pain and it was very easy to install but first instance I've had to 'mod my mods'.