I put a tunnel Tab on my Shadow cat and I am going to put a micro switch in the guage to limit downward travel.How far below level with the tunnel should I limit the travel?

Mark I don't think you will know until you run it

Ask Keith aka Hot Pursuit. Keith ran a high powered and very fast (150+) Shadow for many years. Keith sold the Shadow and has a 40' Skater now, but he's got a wealth of knowledge about the Shadow.
Due