A good source for inexpensive pressure and pressure differential
switches.  They have a variety of models and some are adjustable.

The PSF103 series specifically the 9061902 switch seems to meet the
gear squat needs the best.  you can set it for about 3-10" H20 which
equates to about 60-120 kts.  the 020 switch 2" =/- .5 is about 65
kts.

These don't give you the speed range of the standard lancair switch,
but the price is less than $20 last time I checked.

http://designflexswitches.com/

Dan Ballin