From another page with the same item
Quad EGT 2 1/4" WSK2AQ2
New miniature quad EGT in 2 1/4" size. Includes 4 clamp on type senders (threaded senders available at extra cost).Standard 700-1700 degree range. Top quality, US made, prewired. Self powered, no electrical input needed.
Four EGT will make me faster, its four times as good
Other similar models are available, the one mentioned above is only 250$