jasonc
Member
Most car gauges even old school are estimated pressure as it's based on resistance produced by piezoelectric versus a signal that increases or decreases that is better .unless you are talking about the bourbon guageThat's more of a reason not to use the same check engine lights for evap codes. Though your oil pressure light would hopefully go on. I prefer an actual gauge and that is often done by pressure, not by computer. Even then a redundancy for not having enough oil pressure should have additional check points.
But it's a big difference between oil pressure and a system that's constantly giving you error codes.