[OPRN]

5/40W synthetic oil, Not sure about the filter - good suggestion - I will check.
Pulling the coil wire I don't think is an option as two things are likely to happen. 1) run out of battery before oil pressure came up, 2) probably flood the cylinders with fuel.
It takes about 15 seconds running at idle to get pressure. When previously run that day it's only one or two seconds.
Once the pressure is up it pins the gauge at idle and stays there until fully warm. I have never seen it less than 2/3 up the gauge even coming off the highway at idle.
Thanks all for your prompt replies!