874903 Tachometer | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta tachometer with a black face, 85 mm in diameter, weighing 0.206 kg and listed for 47 applications across D, TWD and TAD series engines. It consolidates five earlier numbers — 873998, 874012, 874497, 874496 and 874758. The white-faced 85 mm tachometer is 874928, which covers the same three engine series; face colour is what separates the two, so match the rest of the panel before ordering.

🚤 Compatibility

• Engine Family: D, TWD, TAD

Full model list at the end of this description.

⚙️ Key Features

• Black face, 85 mm in diameter
• 0.206 kg
• Listed for 47 applications across D, TWD and TAD series engines
• Supersedes 873998, 874012, 874497, 874496 and 874758
• White-faced equivalent is 874928
• 85mm (Volvo assembly listing)

🔌 Function

Displays engine speed at the helm or control station, driven from the engine's speed signal.

⚠️ Common Signs of Failure

• Needle reading zero, sticking, or pinned at full scale
• Reading wandering or jumping while engine speed is steady
• Panel illumination dead while the needle still works
• Condensation or water staining behind the glass
• Reading that disagrees with a second known-good instrument on the same engine

🛠️ Service Notes

• Check the speed signal source and the instrument earth before condemning the tachometer — a bad earth reads exactly like a dead gauge
• The 85 mm instruments share a face size, so colour and scale are what must match the rest of the panel

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 874903 → Supersedes 873998

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D12C-A MP, D12D-A MG, D12D-A MH, D12D-A MP, D12D-B MH, D12D-B MP, D12D-C MH, D12D-C MP, D12D-D MP, D12D-E MG, D12D-E MH, D12D-E MP, D12D-F MP, D12D-G MH, D12D-G MP, D12D-H MP
• Volvo Penta D9A2J, D9A2G, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2A, D9A2C, D9A2E
• Volvo Penta TAD1640-42GE-B, TAD1640GE, TAD1640-42VE-C
• Volvo Penta TAD1641GE, TAD1641VE
• Volvo Penta TAD1642GE, TAD1642VE
• Volvo Penta TAD1140-42VE
• Volvo Penta TAD1150-52VE
• Volvo Penta TAD1170-72VE
• Volvo Penta TAD1240GE
• Volvo Penta TAD1241GE
• Volvo Penta TAD1242GE
• Volvo Penta TAD1643VE
• Volvo Penta TAD1650GE
• Volvo Penta TAD1651GE
• Volvo Penta TWD1643GE
• Volvo Penta TWD1652GE
• Volvo Penta TWD1653GE
• Volvo Penta TWD1663GE
• Volvo Penta TWD1672-1673GE