Hello guys,
Maybe this is interesting to few Data East owner. I have created an electronic ball trough sensor board for my Jurassic Park. I've got a hint, that most probably it will work in GNR, Tommy, LAH, TFTC, WWFRR as well.
If you are interested, please check my post:
https://pinside.com/pinball/forum/topic/jurassic-park-club/page/96#post-4743040