Summitracing.com , Get an Autometer Oil Pressure Guage for around $50-$60.
Advantage? Well it tells you oil pressure at all times, the current sensor lets you know if its 15PSI ( NOT sure) and up, if its under than you have no oil pressure.
I have both in my car, I feel comfortable knowing oil pressure at all times. Up to you man, but all I'm going to say is that it would be the perfect time since there is nothing in your way. I had to buy some fittings , etc to get it to fit by the accessory bracket.