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[Siliconslave]

think hes basically saying that its hard (or impossible) to read a constantly changing digital read out.

An analogue one you can generally see its movement and mentally work out what range its waving about it without needing to read the numbers

 

[Hunders]

I suppose I can see what he may be saying but it's not really that hard to read. It's just the numbers after the decimal point that are constantly shifting - In fact, you can change the resolution of the readout to be accurate to 0.1, 0.5 or 1. It has a peak hold function, too.

 

[Dogbreath]

think hes basically saying that its hard (or impossible) to read a constantly changing digital read out.

An analogue one you can generally see its movement and mentally work out what range its waving about it without needing to read the numbers

Exactly right. If you have a parameter that is almost static, or moves slowly e.g. time, temperature, odometer, average MPG etc then a digital readout makes it easy to read the value to a useful precision.

Other parameters like boost, RPM, AFR etc. can change very quickly and in these applications a digital display just gives you a sequence of numbers which is very difficult to extract useful information from quickly. The other problem is the trade-off between the display update rate and being able to see transient values. If the display is updated very quickly to make it more likely to capture transient values, then it becomes even more difficult to read. A peak capture helps, but you only find out about it after the event.

An analog gauge shows both the current value and the trend by the direction the needle is moving in, and you don't need to actually 'read' it, you can judge the position of the needle far more quickly than you can read a digital display.