Description

This is not an official Garmin sensor — it is an aftermarket replacement alternative to the GTP 59 OAT probe (P/N 011-00978-00). As such, it can only legally be used with experimental aircraft or similar non-certified applications.

Compatibility: Tested and confirmed working with the G3X system via GSU 25c. Should also be compatible with the G5, though we have not tested that configuration ourselves.

What’s included: Probe with ~1 m lead wire and one nylon washer. No pins or connectors included — just the probe and wire. If you’re running it into the wing, you’ll need shielded 3-conductor wire for the full length of the run.

Shield grounding: You can optionally connect the cable shield to the probe body with a ring terminal, or leave it floating and ground only at the connector end. Either works — we left ours floating.

Metal aircraft: You MUST place a nylon washer on BOTH sides where the probe secures through the skin. One is included to protect your paint — you’ll need a second one for the back side if your aircraft is metal.

Installation support: Available via DM. Seriously — reach out before initiating a return if the wiring is confusing. We’d rather help you get it working than process a return.

Pro tip: Don’t bother trying to label the wires after running the length. Grab some alligator clips and trial-and-error which leads go where. That’s how we did it.