[tazandjan]

Looked at my 575M gauges a while back and noticed some interesting translations from metric to English measurements. Thought your oil temperature gauge had 20 deg F markings? Guess again, 120 deg to 230 deg (110 deg) is not divisible by 20. Actual markings are 18.33 degs each, so the marks on the gauge mean:

120.00 deg F
138.33 deg F
156.67 deg F
175.00 deg F
193.33 deg F
211.67 deg F
230.00 deg F
etc

Maybe your car is not as warmed up as you thought? The third mark is the closest equivalent to the 70 C/158 F warning in the owners manual before exceeding 4000 rpm. I consider the third mark fully warmed.

Aberration, right? Guess again because the water temperature gauge looks like 10 deg markings, but they are actually 8.75 degs each. So the marks on the gauge mean:

140.00 deg F
148.75 deg F
157.50 deg F
166.25 deg F
175.00 deg F
183.75 deg F
192.50 deg F
201.25 deg F
210.00 deg F
etc

Only one left and that is oil pressure. Looks like 10 psi markings, but they are actually 14 psi, so the marks on the gauge mean:

0 psi
14 psi
28 psi
42 psi
56 psi
70 psi
84 psi
etc

Here are the actual gauges in my car. Check for yourself and see if yours are not the same.

[Boxer]

Mine are all in C so not an issue.

[wetpet]

just did this calculation in my head for the temp gauges the other day while driving, but i didn't write them down.

[Saint Bastage]

Funny...I never cared what the value was because I don't believe these gauges are anything close to calibrated. My Speedo vs. GPS is an indication of just how far off these meters are. I just know my oil temp should be between this line and that line, Oil pressure is a function of RPM, Voltage around there, etc...

[tazandjan]

Lane- Now you can recalibrate which lines are important and see if you were correct. As for calibration, what else are you going to use?

[Saint Bastage]

Originally Posted by tazandjan

Lane- Now you can recalibrate which lines are important and see if you were correct. As for calibration, what else are you going to use?

I suppose I'm missing your question. My point is that I don't care if my actual water temp is 175ºF or 183ºF as long as the needle points to the same place given the circumstances. After 4 years of ownership and 15,000 miles I can tell when something isn't right through many different senses. A needle pointing to something out of the ordinary doesn't need a value. I can tell its out of place with a simple glance.

I do understand your point that the assumed scales on the dashboard are not as expected.

[tazandjan]

Lane- Close enough. This is not rocket science, and I should know.