[san rensho]

I have a pencil gauge and a cheapo dial gauge and they both read within 1psi of each other Close enough for the girls we go with as my high school math teacher would say.

Don't obsess about tenths of psi. Play with tire pressure and get a feel for how changing pressure affects handling. The single easiest, cheapest and probably most change you can make to your suspension set up is by changing tire pressure.

The factory specs for pressure have a huge front tire low pressure bias to induce understeer, 29/36 if I remember correctly.

But understeer is precisely what you don't want for spirited driving. So run equal pressures on all tires, like I do which gives just a bit of oversteer. Or experiment, run 2,4 psi lower in the rears and see how it feels, should induce more oversteer if you like that.

So just use any gauge that gives consistent readings, the actual values don't matter, what matters is how the changes affect handling.