87856156T04 Mercury MerCruiser Switch Oil Tank Sender | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Oil Tank Sender Switch Assembly - Part Number: 87-856156T04

A genuine Quicksilver oil tank sender switch assembly used on selected Mercury and Mariner oil-injected outboards. This switch mounts in the engine oil tank system and forms part of the low-oil warning circuit, helping alert the operator when oil level or oil system status requires attention.

⚙️ Key Features

• Genuine Quicksilver OEM oil tank sender switch

• Correct Mercury part number 87-856156T04

• Supersedes earlier 87-856156A4 oil tank switch reference

• Used on selected Mercury / Mariner DFI, OptiMax, Pro XS and Sport outboards

• Important component in the low-oil warning and engine protection system

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 87-856156T04 → Supersedes 87-856156A4

• 856156A4 earlier OEM switch assembly reference

OEM / Related Numbers:

• 87-856156T04

• 856156T04

• 87856156T04

• 87-856156A4

• 856156A4

• 856156

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Mercury / Mariner oil-injected outboard oil tank sender and low-oil warning systems

Typically suits:

• Engine models:

• Mercury 75 DFI 1.5L 3-cylinder - serial 0T980000 to 1B226999

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B417702 to 1B736885

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 80 Jet DFI 1.5L 3-cylinder - serial 1B586067 to 1B736885

• Mercury 80 Jet DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 90 DFI 1.5L 3-cylinder - serial 0T801000 to 1B226999

• Mercury 90 DFI 1.5L 3-cylinder - serial 0T980000 to 1B226999

• Mercury 90 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701

• Mercury 90 DFI 1.5L 3-cylinder - serial 1B417702 to 1B736885

• Mercury 90 DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 115 DFI 1.5L 3-cylinder - serial 0T801000 to 1B226999

• Mercury 115 DFI 1.5L 3-cylinder - serial 0T980000 to 1B226999

• Mercury 115 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701

• Mercury 115 DFI 1.5L 3-cylinder - serial 1B417702 to 1B736885

• Mercury 115 DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 115 Pro XS 1.5L 3-cylinder - serial 1B751825 and up

• Mercury 125 DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 175 DFI / OptiMax 2.5L - serial 1B227000 to 1B417701

• Mercury 175 DFI / OptiMax 2.5L - serial 1B417702 and up

• Mercury 200 DFI / OptiMax 3.0L - serial 0T801000 to 1B417701

• Mercury 200 DFI / OptiMax 3.0L - serial 1B417702 and up

• Mercury 225 DFI / OptiMax 3.0L - serial 0T599000 to 0T800999

• Mercury 225 DFI / OptiMax 3.0L - serial 0T801000 to 1B417701

• Mercury 225 DFI / OptiMax 3.0L - serial 1B417702 to 1B504988

• Mercury 225 DFI DTS 3.0L - serial 0T599000 to 1B417701

• Mercury 225 DFI DTS 3.0L - serial 1B417702 to 1B504988

• Mercury 225 Pro XS 3.0L DFI - serial 1B104549 to 1B426560

• Mercury 250 DFI / OptiMax 3.0L applications using oil tank sender switch 87-856156T04

• Mercury 250 Pro XS 3.0L DFI applications using oil tank sender switch 87-856156T04

• HP Range: commonly 75HP - 250HP DFI / OptiMax / Pro XS oil-injected applications

• Engine Type: Mercury / Mariner DFI / OptiMax 2-stroke outboard

• System Type: Oil tank sender switch / low-oil warning circuit

🔌 Function

The oil tank sender switch monitors the oil tank level or switch position and provides input to the warning circuit so the operator is alerted to low oil or oil system fault conditions.

Common signs of failure:

• False low-oil warning alarm

• No alarm when oil tank level is low

• Intermittent oil warning signal

• Oil warning fault after wiring and oil level checks

• Switch fails continuity or float operation testing

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging