welp most people put guages because they need it , things like boost, egt, wideband,oil press on modded engine ect,putting guages in for vac and volt does not do it, I dunno maybe you have other reasons behind it, and its not my car but oh well......and why are you wanting the rb20 for? it makes less power then the sr20det , parts are more hard to find, the wiring is more diff, have to use custom mounts, ect? rb20 are only cool when they are fully built, which is going to be hard to even find someone to carry rods for the engine, or cams ect...... what are you going to do when your volt meter tells you alternator in your rb20 is going out and you can not find one for it?