Actually first thing I did before going turbo was install Oil Pressure and Water Temp gauges. After a couple of minor problems I can say I didn't blow my engine thanks to those indicators.
The water temp. sensor (autometer) is very precise so when I saw the water temp. gauge not moving I was really sure that I was out of water at all. And when the engine was too hot (but not too much on the OEM temp. indicator) the oil pressure started to go down a little bit. At that moment I stop the car and checked!
So, exactly as irf305 said, it's very important to have those gauges. I totally agree with that!
The water temp. sensor (autometer) is very precise so when I saw the water temp. gauge not moving I was really sure that I was out of water at all. And when the engine was too hot (but not too much on the OEM temp. indicator) the oil pressure started to go down a little bit. At that moment I stop the car and checked!
So, exactly as irf305 said, it's very important to have those gauges. I totally agree with that!