Why couldn't it be electrical? It looks there is a break in the circuit that is causing it fluctuation. However, I will certainly check to see if the oil line is clogged. I just did an oil change and the o-rings were 100%.well there's no way it can't be an electrical issue.
your oil line could be clogged, there is a line running from the oil filter housing to the back of the gauge cluster. also the o-rings on the oil filter cover could need replacing
Does anyone know how to clean that line?