Aetna Engineering
Precision digital tachometers, shaft-speed instruments, senders, and sensors for marine and industrial RPM monitoring.
Aetna Engineering, manufactured by Fireboy-Xintex, produces solid-state digital engine and shaft tachometers, mechanical senders, magnetic sensors, and installation accessories. Its Classic Series instruments are permanently calibrated and designed for precise RPM readings, helping operators synchronize engines and find efficient operating speeds.
Products from Aetna Engineering
51 products
Aetna EngineeringAetna SS-3 Speed Sensor
Speed & directional sensor (use with tach tape and directional tach).
SKU AET-SS-3
$1,090.00MSRP $1,270.00
Aetna EngineeringAetna SS-4-40 Speed Sensor
Speed sensor 4" long (use to sense passage ferrous metallic objects or gear teeth).
SKU AET-SS-4-40
$535.00MSRP $625.00
Aetna EngineeringAetna TT-100 Tach Tape
Tach tape, for use with directional sensor SS-3, per foot.
SKU AET-TT-100
$60.00MSRP $70.00
Choose the right Aetna tachometer system
Start with the display style and application: 8402R models use bright LED readouts, while 8905R models use LCD displays. Match the instrument to a gas engine, diesel engine, or direction-indicating shaft installation, then select the compatible sender, sensor, drive adapter, and wiring accessories.
Accurate RPM monitoring for marine engines and shafts
Aetna Engineering instruments are manufactured by Fireboy-Xintex for precise engine-speed and shaft-speed monitoring. The solid-state designs are permanently calibrated and have no moving display parts to stick or wear out.
- Digital engine and shaft tachometers
- LED and LCD display options
- Mechanical senders and magnetic speed sensors
- Drive adapters, reducers, trim rings, and installation accessories
Frequently asked questions
Who manufactures Aetna Engineering products?
Aetna Engineering products are manufactured by Fireboy-Xintex. Aetna is the instrumentation brand used for its digital tachometers, shaft tachometers, senders, sensors, and related accessories.
What is the difference between Aetna 8402R and 8905R tachometers?
The 8402R Series uses a red LED display, while the 8905R Series uses an LCD display. Both families include models for specific engine, bezel, hour-meter, and direction-indicating applications, so the complete part number matters.
How do I choose a sender or sensor for an Aetna tachometer?
Match the sender or sensor to the tachometer model and the engine or shaft pickup method. Check the full Aetna part number and installation requirements before ordering; contact our technical team if you need help confirming compatibility.
Need a quote on Aetna Engineering gear?
Tell us what you're building. Our team will spec the right kit for your install and send a written quote.
Why buy from us
We carry this brand because it earns its place on the boat.
Stocked for marine builds
We focus on parts that meet the conditions boats see — not just whatever ships fastest.
Engineering review on request
Send a parts list or a layout and we'll check it against your boat before you order.
Direct from our team
Pricing, availability, and product questions all go through the same people who build custom harnesses and panels.