oil pressure gauge

Hi everyone! I own a 72 Norton Commando (small drain plug) and was going over the whole thing, replacing old worn out parts, cleaning it up, etc. I ended up purchasing all new stainless oil Iines (from OldBritts) and an SDK Oil Pressure Relief Valve (from Classic British Spares).The lines were...

Im trying to figure out if I want or need an oil pressure gauge. Ive seen a few of them and some are expensive and others just look cheap. Ive been reading all sorts or threads and some people say that due to the inconsistency of the oil pump the gauge is not necessary, others say its a must...