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Since this is a commercial vehicles category, I shall tell you how to shift via the tach.
Every truck has an optimal RPM range. If you fall below that range the engine could stall; go above it and you'll use too much fuel. For this, our optimal range is going to be 1000 to 1500 rpm.
When you are upshifting, you accelerate until the engine is running 1500 rpm, then shift.
When you are downshifting, you decelerate until the engine hits 1000 rpm, then downshift.
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The 1500/1000 RPM range is sort of a default taught by truck driving schools. In reality, your upshift and downshift points will vary in accordance with a number of factors. Try upshifting at 1500 while on an incline in the mountains, and it won't work out very well for you. Same thing when it comes to heavy haul, or anything off-road. Personally, I prefer to upshift at 1900 - when you shift into the next gear, it puts you in that gear while you're still within the torque band, which is important - if you upshift at 1500, you typically hit the next gear at an RPM range just below the power band. While this may work out sufficiently in parts of Texas or Florida, where it's flat, all it'll do is bog down the engine in any place which isn't. This is hard on the drivetrain.
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