Help with new gauge setup

morning Daniel

that's an interesting project you got going on there

the very first picture you posted is a mounting boss for something (A/C mount maybe?)
no point plugging anything in there since it is a blind hole (otherwise it would be shooting water, oil, or exhaust fumes the moment you fire up the engine right?)

the two middle pictures I'm not sure about (I'm running a weiand on my duster)
I would run the engine for a minute and pull the plug on the driver side and see if the bottom is wet, if it is, put you water temp sensor there)


the port in the back by the distributor is your oil pressure sender port