If you place a straight edge on the dish face (top edge to bottom edge) what is the elevation angle reading?
Found this description of how to use the meter. Seems spot on to my memories of using these units.
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1. Connect the "IF" output of your down converter or LNB to the "IN" connector on the PP-1450
2. Connect the PP-1450 output to the receiver's "IF" or LNB input.
3. Turn On the receiver and select either a horizontal or vertical transponder.
4. Set the attenuator switch on the PP-1450 to the "OUT" position.
5. Turn the sensitivity control to the clockwise "MAX" position.
6. Depress the "RESET" button for 3 seconds and release. the needle should point to the black bar area on the right hand side of the meter.
7. If The Needle Does Not Point to the Black Bar Area, decrease the sensitivity control slightly and depress the reset button for 3 seconds. Continue this operation until the needle points to the bar area on the figure. In regions of strong signal, the meter may not reset even with the sensitivity control turned to minimum. If this occurs, set the attenuator switch to the "IN" position and restart step 5.
8. Aim The Antenna; the PP-1450 looks at all frequencies present on the "IF" line. As you begin to acquire a signal, the meter will move, or dip, to the left.
9. When the Needle Reaches the Left Side of the Meter stop position the antenna and press the reset switch for 3 seconds. The meter should reset to the black bar area. Continue aiming the antenna. Note: If the meter does not reset, alternately turn the sensitivity know CCW and depress the reset switch for 3 seconds. Repeat this operation until the meter returns to the black bar area.
10. Continue To Aim The Antenna. Repeat steps 8 and 9 above until no further antenna movement results in a decrease in the needle position. The meter will indicate it's lowest position to the left. Your antenna is now precisely aimed.