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I use a simple RV-type level gauge above the driver's door of my diesel F250 tow vehicle. It's not precise enough to do anything but to confirm what my exhaust gas temperature gauge and boost gauge have already indicated, whether I'm going up or down. However, it's worth the $2 I invested in it as it does show roughly the extremity of the hill, ie whether it's a 5 degree or a 10 degree hill, etc. More than once I've looked at the gauge to see why my EGTs or boost have changed, as sometimes gradual gradients are hard to discern.
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