This dual display capacitor monitor kit is simple to add to most capacitors. You simply remove the terminal screws from your cap and install the threaded rods. Then the clear or smoked plastic ring lens and the round display board (your choice of "X" or "Y" orientation of the readout board) is placed over the rods. Finally the clear "colorform" insulator and the thin nuts are tightened (not too much) and the thick nuts are used to attache your wiring. The third smaller terminal is used to trigger the display so it does not drain the battery when not in use. Also there is a charge plate so the Hlabs charge resistor is not needed. Voltage is read out in 3 digits.