anyone wanna guess what my 1/8 mile will be

low pressure gauge only goes to 15psi...

Yes, or at least one that's 30/40ish and under. A pound in a Bias ply makes a big difference. The radials are a little more forgiving. I used to make my own many years ago by buying gauges from Grainger and rigging the hose and ends. Not really necessary today as so many options are available from the big box stores.