I have to respectfully disagree on the lack of accuracy and utility of electrical gauges stated in previous posts. No lack of respect, guys, but I just don't think that's the issue any more. It may have been true 20 years ago, but modern electrical gauges are just as accurate and responsive as mechanical gauges, and much easier to install. They are certainly not anything like idiot lights.

Most of the gauges have to be electrionic anyhow. You can have mechanical speedometers - but the electricals are much easier to calibrate. You can have a mechanical tach - but those are dinosaurs. Most modern drag racers all run computer controled tachs with multiple readouts. You can have a mechanical oil pressure gauge - but the transmitters on modern electrical oil pressure gauges are much less likely to go out of adjustment than the old Bourdon tube mechanical gauges. The rest pretty much have to be electrionic. Water temp - electrical is pretty much all there is, same with oil temp, same with volt or amps. Heck, even the gauges in an FA-18 Hornet are all electronic

As to liquid-filled gauges, unless you're running the Baja 1000, or all of your tires are out of round, why bother? They're more expensive, the bubbles look goofy, and they're totally unnecessary on 95% of the vehicles out there. The only exception I make is a mechanical fuel pressure gauge in the fuel line next to the carb inlet.

Auto Meter and VDO both make fine gauges.

Not trying to start an argument, but I have used all types of gauges for 45 years, and that's my experience.