The STC approved Peregrine squat switch required for use with the Trig TN70 is $125.00 from Aircraft Spruce & Specialty.
https://www.aircraftspruce.com/catal...it10-05913.php
It has been mentioned a cheaper pneumatic squat switch could be used if intended for an experimental glider running the TT22/TN72 combo.
Please identify suitable "experimental" pneumatic squat switches.
Thanks.