Lets see your gauge cluster set ups

Been thinking of adding an oil pressure guage, but already have a 8 track player hanging under the dash, so a full size gauge might be a knee knocker, so I have been looking at oil pressure gauges for motorcycles, have seen where they range from 1 1/2" to 15/16". The only problem is they are all mechanical and I don't know about running oil line inder the dash. I was thinking the 15/16" gauge I could probably remove the cigarette lighter and enlarge the hole and mount the guage there.
Aaron