Rule Deluxe 3-Way Panel Lighted Switch f/Auto Float 24/32VDC [42] Wichard Wide D Shackles A pressure gauge operates by

A pressure gauge operates by sending a low amperage current through the gauges' meter to ground via a sending unit with variable resistance

This 1 " diameter extension mast can be used to increase height of an antenna and thus improve effective range

What it means to you is much better target resolution

DC Ground:    YES - however

Safe Working Load (lb) - 440

Rule Deluxe 3-Way Panel Lighted Switch f/Auto Float 24/32VDC [42] Wichard Wide D Shackles A pressure gauge operates byDeluxe 3 Way Panel Lighted Switch f Auto Float 24 32VDC Controls any pump equipped with an automatic float switch. Toggle has three positions (automatic, off, or manual) and has a "fail safe" spring return to "off" from the "manual" position. Panel is black stainless steel and has red indicator light and fuse holder. Specifications: Voltage: 24 or 32VDC Amp Draw: 10 or 6. 5 Amp Dimensions: 2" x 3 1 4" WARNING: This product can expose you to chemicals