My oil pressure gauge doesn't start to rise till the engine runs about 8-10 seconds or so. This interesting problem happend over night, last night it was fine now today it does wanna rise like it used to. I checked the oil level and it's fine. I dont know what is causing this. My gauge and isolator have been installed for 3 days and the car has probably only ran for 15 minutes total. Any ideas would be very helpful, thanks.