Sierra Lido Pro GPS Speedometer - Available in 35 MPH and 60 MPH

The Sierra Lido Pro GPS Speedometer is a 3-inch helm gauge that reads boat speed using GPS signal rather than a paddlewheel sensor or pitot tube, so there is no thru-hull sensor to install, foul, or replace. Because it relies on GPS positioning instead of water flow, the reading stays accurate regardless of hull condition, trim angle, or marine growth on a traditional sensor. The Lido Pro is built for a clean, direct helm installation into a standard 3-inch gauge cutout, making it a straightforward upgrade or replacement for boats that already have a matching opening at the dash.

This gauge is offered in two full-scale speed ranges so it can be matched to the boat it is going into: a 35 MPH range suited to pontoons, cruisers, and other displacement or moderate-planing hulls, and a 60 MPH range for faster runabouts and performance boats that need a wider scale to keep the needle in a useful part of the dial at speed. Both versions share the same Lido Pro gauge face and 3-inch form factor, differing only in the speed range printed on the dial and the internal calibration that supports it.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 781-310
• Gauge Type: GPS Speedometer
• Series: Lido Pro
• Diameter: 3 inches
• Speed Range Options: 35 MPH, 60 MPH
• Sensor Type: GPS (no paddlewheel or pitot tube required)

Sizes & Options

Choose the Lido Pro by top speed range: pick the 35 MPH gauge for boats that cruise and top out in the lower range, such as pontoons and displacement-hull boats, and pick the 60 MPH gauge for faster runabouts and performance boats. Matching the range to the boat's actual top speed keeps the needle reading in the most legible part of the dial.

Frequently Asked Questions

What speed ranges does the Sierra Lido Pro GPS Speedometer come in? Two full-scale ranges are available: 35 MPH and 60 MPH, so the dial scale can be matched to the boat's actual top speed.

How do I know whether to order the 35 MPH or 60 MPH version? Match the gauge to the boat's realistic top speed: the 35 MPH Lido Pro suits pontoons and displacement or moderate-planing hulls, while the 60 MPH Lido Pro is meant for faster runabouts and performance boats that need the wider scale.

Does this speedometer need a paddlewheel sensor or pitot tube installed in the hull? No. The Lido Pro reads speed from GPS signal, so there is no thru-hull sensor, paddlewheel, or pitot tube to mount or maintain.

What size gauge cutout does the Lido Pro GPS Speedometer fit? The Sierra Lido Pro is a 3-inch gauge, sized for a standard 3-inch helm cutout.

Will marine growth or hull condition affect the speed reading? No, because the Lido Pro determines speed from GPS rather than water flow past a sensor, so growth or fouling on the hull does not affect accuracy.

Is a wiring harness or transducer needed to install this gauge? Since the Lido Pro is GPS-based, it does not require a separate speed transducer to be plumbed or wired in like a traditional paddlewheel speedometer.

Can I replace an existing 3-inch speedometer with this one? Yes, the 3-inch diameter of the Sierra Lido Pro matches the standard 3-inch gauge opening used for most helm speedometers.

What is the difference between the two Lido Pro speedometer options? The only difference between the two Sierra Lido Pro GPS Speedometer options is the dial's full-scale speed range, 35 MPH versus 60 MPH; the gauge size and GPS sensing method are the same.

Is the Lido Pro speedometer part of a matched gauge series? Yes, the Lido Pro is part of Sierra's Lido gauge lineup, sharing the same 3-inch face style as other Lido series gauges.

What part number is the Sierra Lido Pro GPS Speedometer? It is cataloged under Sierra part number 781-310, with the 35 MPH and 60 MPH versions sharing that stem.