79-816857A-1 Mercury Fuel Gauge | Genuine Used Part
79-816857A-1 Mercury Fuel Gauge | Genuine Used Part
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🔧 Product Description
Genuine Mercury Quicksilver QSI Fuel Level Gauge - Part Number: 79-816857A1
A genuine used Mercury Quicksilver QSI analog fuel-level gauge for conventional 12-volt marine fuel-tank sender systems.
This legacy gauge displays tank level from EMPTY to FULL using the matching resistance sender. Sender range, ground quality and wiring polarity must be confirmed before installation.
⚙️ Key Features
- Genuine Mercury Quicksilver OEM QSI fuel gauge
- Correct Mercury part number 79-816857A1
- Analog EMPTY-to-FULL fuel-level display
- Designed for conventional 12-volt marine instrumentation
- Suitable for standard US-type 240-33 ohm senders when calibration matches
🚤 Compatibility
Commonly used on
- Mercury, Mariner and MerCruiser 12-volt helm instrumentation
- Marine fuel tanks fitted with a compatible 240-33 ohm sender
Typically suits
- Engine models:
- Mercury and Mariner outboard-powered boats using a stand-alone analog fuel sender
- MerCruiser sterndrive and inboard boats using a stand-alone analog fuel sender
- Single-tank 12-volt marine installations with FULL approximately 33 ohms and EMPTY approximately 240 ohms
- HP Range: Not engine-specific
- Engine Type: 12-volt marine fuel-level instrumentation
- Year Range: Approximately late 1980s - 1990s
🔌 Function
The gauge measures resistance through the tank sender and converts it into an approximate fuel-level reading. It requires a sound sender ground, correct sender resistance and stable instrument power.
⚠️ Common Signs of Failure
- Gauge remains on EMPTY or FULL
- Needle changes sharply when the boat moves
- Reading is inaccurate because the sender range is mismatched
- Corroded sender or ground wiring causes intermittent operation
- Internal gauge movement or illumination fails
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 79-816857A1 current known OEM service reference
- 816857A1 original unprefixed Mercury reference
OEM / Related Numbers
- 79-816857A1
- 79-816857A-1
- 79816857A1
- 816857A1
- Mercury QSI fuel-level instrument
Aftermarket / Verified Equivalents
- Sierra: 57902P - Amega 240-33 ohm fuel gauge
- Veethree: 57902E - Amega 240-33 ohm fuel gauge
- ECMS: 800-00129 - 240-33 ohm marine fuel gauge
📦 Condition
- Genuine used part
- Removed from running engine where applicable
- In good working condition unless otherwise stated
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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