Sierra MP41400 Complete Audible Warning Kit - Engine Oil Pressure and Temperature Alarm

The Sierra MP41400 Complete Audible Warning Kit is a self-contained alarm system that alerts the operator to two of the most common causes of engine damage: low oil pressure and high engine temperature. Rather than relying on the operator to periodically glance at gauges, this kit sounds an audible buzzer the moment either condition is detected, giving faster warning than a visual gauge alone.

The kit is built around three components that work together: an oil pressure switch that trips at 6 PSI, a temperature switch that trips at 200 degrees F, and a buzzer switch that produces the audible alert. All wiring, switches, and installation instructions needed to set up the warning circuit are included in the kit, so no separate parts sourcing is required for a standard installation. The oil pressure switch is a normally closed 1/8 inch - 27 thread design, while the temperature switch uses a 3/8 inch - 18 thread, both sized to thread into standard engine sending unit ports.

For installations that call for a different oil pressure trip point, an optional 15 PSI oil pressure switch (OP22891) is available as an alternative to the standard 6 PSI switch included in the kit. This kit has a universal fit and is not limited to a specific engine make or model, making it suitable for a wide range of inboard and sterndrive engine installations that use standard sending unit style switches.

Specifications

• Brand: Sierra
• Manufacturer Part Number: MP41400
• Product Name: Complete Audible Warning Kit
• Oil Pressure Switch Part Number: OP22900
• Oil Pressure Switch Setting: 6 PSI
• Oil Pressure Switch Thread: 1/8 inch - 27
• Oil Pressure Switch Type: Normally closed
• Temperature Switch Part Number: TS25101
• Temperature Switch Setting: 200 degrees F
• Temperature Switch Thread: 3/8 inch - 18
• Buzzer Switch Part Number: MC33502
• Optional Oil Pressure Switch (Alternate): OP22891, 15 PSI, 1/8 inch - 27, normally closed
• Kit Includes: Installation instructions, oil pressure switch, temperature switch, buzzer switch
• Color: White
• Fit Type: Universal
• Weight: 0.41 pounds

Fitment

This kit has a universal fit and is not restricted to a specific make, model, or year.

Frequently Asked Questions

What does the Sierra MP41400 warning kit do? It sounds an audible buzzer to alert the operator when engine temperature gets too high or when oil pressure drops too low, so problems are caught before they cause engine damage.

What is included in the MP41400 kit? The kit contains installation instructions, an oil pressure switch (OP22900) set at 6 PSI, a temperature switch (TS25101) set at 200 degrees F, and a buzzer switch (MC33502).

At what pressure does the included oil pressure switch trigger the alarm? The oil pressure switch included in the MP41400 kit, OP22900, is set to trip at 6 PSI and is a normally closed switch with a 1/8 inch - 27 thread.

At what temperature does the alarm sound? The temperature switch in the MP41400 kit, TS25101, is set at 200 degrees F and has a 3/8 inch - 18 thread.

Is there an option for a different oil pressure trip point? Yes, OP22891 is an optional oil pressure switch that trips at 15 PSI instead of the standard 6 PSI switch included in the MP41400 kit, for installations that need a higher pressure threshold.

Does this kit fit a specific engine make or model? The MP41400 Audible Warning Kit is a universal fit product and is not limited to a particular engine make, model, or year.

What thread size is the oil pressure switch? The OP22900 oil pressure switch included with the MP41400 kit uses a 1/8 inch - 27 thread and is normally closed.

What thread size is the temperature switch? The TS25101 temperature switch included with the MP41400 kit uses a 3/8 inch - 18 thread.

How much does the warning kit weigh? The Sierra MP41400 Complete Audible Warning Kit weighs 0.41 pounds.

What color is the buzzer/kit housing? The MP41400 warning kit is white.

Do I need any additional parts to install this kit? No, the MP41400 kit is complete with the oil pressure switch, temperature switch, buzzer switch, and installation instructions all included.

Can I use the buzzer switch (MC33502) separately from the kit? The MC33502 buzzer switch is supplied as part of the MP41400 Complete Audible Warning Kit and is the component that produces the audible alert when either the oil pressure or temperature switch is triggered.