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From $22.75 to $189.95
Description Part No. Price Buy
Standard 1 set point, PF or FM mounting
Standard 2 set point, PF or FM mounting
Standard 5 set point, PF or FM mounting
Standard SAE 5-hole flange mounting kit
Advanced NPT fuel probe
NPT-Electronics module
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Easy Push Button Calibration - Simple push buttons make calibration easy and accurate.

Intended for Experimental Aircraft - This is not a certified unit

No sensitive screw adjustments to make. Place the probe in tank,
connect power and press EMPTY. Fill tank and press FULL. Calibration is

Steady Readings - Digital filtering minimizes the effects of fuel slosh
providing greater accuracy.

Proven Design - Specifically designed for aircraft that are subject to harsh
environments, such as vibration, temperature, and electrical noise. Probes
designed for industrial applications can fail under these conditions. Proven
reliability with over 10 years of history.

SAE 5 Hole Bolt Pattern - Industry standard flange mount compatible.

Unique Press fit installation option - Simply drill a 1/2" hole and use a
rubber bushing to seal and hold the probe in place.

No Moving Parts - Nothing to wear out.

Output - 0 to 5 Volts

Compatible Fuel Quantity Gauges - UMA P/N: 18-260-1C1 (P/N 10-02410)
Westach P/N: 20A4V (P/N 10-01255) & 2A7V (P/N 10-01246) and other 0-5V gauges.

Standard Model - Round puck with SAE 5 Bolt Pattern and Press-fit Nipple.
Available with 2 or 5 set points. 5 set points are used for odd shaped
tanks. Probes can be shortened to 3 inches of measurable length. Optional 3
or 5 inch bendable section starting at the probe. The bend section does not
measure fuel. Standard overall lengths 12, 18 and 24 inches, bend section
reduces measureable portion. Custom lengths from 25 to 48 inches with a 2
week lead time. Includes a SAE 5 hole rubber gasket or Press-fit rubber
bushing, specify when ordering.

Optional Standard SAE 5-Hole Bolt Pattern Mounting Kit - Contains a backing
plate with taped holes, gasket, AN3H-12A bolts, and washers.

Advance NPT Model - 1/8" Male NPT Fitting, separate 5 set point electronics
using FAKRA SMB connectors. Standard lengths of 24 and 48 inches without any
bend section. Ordering bend section requires special consideration for
mounting. The NPT fitting is not removable. Usually a second compression
fitting is used. Custom lengths 6 to 92 inches with a 2 week lead time.

Ordering Standard Model: (LL-BB-SS-MM)
LL - Length (12, 18, 24 inches or 25 to 48 inches custom)
BB - Bendable Section (NB= non-bendable, 3B= 3 inch, 5B= 5 inch)
SS - Set points (1S= Empty, 2S= Empty/Full or 5S= Empty,1/4,1/2,3/4,Full)
MM - Mounting method (PF= Press Fit Bushing, FM= Flange Mount Gasket)
Example: A 12", non-bendable, 2 set point probe using a press fit mounting
part number would be 12-NB-2S-PF

Ordering Advanced NPT Model: (LL-BB-SS-NPT)
LL - Length (6 to 92 inches) note: only 24 and 48 inch lengths without any
bend section are stocked.
BB - Bendable Section (NB= non-bendable, 3B= 3 inch, 5B= 5 inch)
SS - Set points (1S = Empty, 2S= Empty/Full, 5S= Empty,1/4,1/2,3/4,Full)
NPT = Mounting method 1/8" National Pipe Thread, this is the only option.

Note: 1S is for computer based displays.



I’m hoping that it is 5 star. I have followed the Aircraft Spruce catalogue instructions to come up with a Princeton capacitance probe configuration that I wish to use. But it seems that Aircraft Spruce is unable to quote on this combination of Ordering Standard Model when I substitute in my configuration for LL-BB-SS-MM. Aircraft Spruce instructions should allow my substitution for these letters to become 31-NB-2S-FM (as per their catalog instructions). However I have been told in a reply email from Aircraft Spruce that this does not identify in their catalog. ..... that is because it is Considered to be a special order as described in the catalog! Could someone from Aircraft Spruce please tell me how I can place this special order thanks, as contacting you twice by email with this enquiry has got me nowhere with the responses received so far.

Matthew D
May 12, 2021

Had one of these on a used aircraft I purchased. It was not working. Emailed the company to get some info, and they offered to replace it. I emailed back that I was not the original owner. They said Lifetime Warranty, give us your shipping address. New unit in the mail, installed, calibrated in a few minutes, working every since, about four years. Cant beat the unit, or the company!

Danal E
October 11, 2017

Per the manufacturer: Running a 50:1 mix for a 2-stroke will not cause the calibration to drift. Changing from 100LL to auto gas will drift the calibration. Changing from ethanol-free auto gas to ethanol auto gas will change the calibration, potentially quite a bit.

July 23, 2021

Just went out of calibration again. Fourth time. Last recalibration was three weeks ago. Running a WesTach 2A7V gauge on it. 33 flight hours. Looking for a replacement. I did see the other review about getting a lifetime replacement quickly but I need to have faith in my fuel gauge and probe and this is not getting it.

July 19, 2021

Installed, worked fine for a few days then, had to recalibrate. Recalibrated again. Now not working again. Recalibrating for the fourth time. If it doesnt work this time I will pull the wing off and try something else.

February 6, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is it possible to install the Princeton sender on the bottom of the tank (upside down)?

Yes, per the installation manual you can mount on the bottom of the tank.

Q: Can the Princeton sender be used in a 24 volt electrical system?

Per the manual you can use 10 to 28 volt system.

Q: Are there any issues interfacing the Princeton probes with the Dynon Skyview System?

Dynon recommends using a capacitive type probe for the Skyview so this will work.

Q: Are the Princeton probes cutable?

No, for an exact length, please email us the part number you want and the length and we can quote you the special order probe.

Q: Can the Princeton Capacitance Fuel Probes touch the side of a poly tank?

Per the manufacturer, This would be fine.

Q: Will PN: 10-00257 work with the ISS fuel level gauge?

As the Princeton Capacitance Fuel Probes are of the capacitance type, they will not work with the ISS fuel level gauge.

Q: We are interested in bendable probes and which are also cuttable.

For an exact length, please email us the measurements for the exact part number you want we can send you a quote. We can also try to find a suitable bendable one with the manufacturer.

Q: Is part number 10-00258 capacitance type? What is PF or FM mounting?

Part Number 10-00258 is the capacitance type. For the mounting method (PF= Press Fit Bushing, FM= Flange Mount Gasket).

Q: Is the 05-01039 bushing a suitable replacement for the busing included with the princeton probe?

Yes, it is a suitable replacement.

Q: Will the Princeton senders work if connected to the Electronics International FL-2CA Capacitive Fuel Gauge ?

Per the manual this will only work with gauges 0-5V which is FL-2, part # 11-03789.

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