See my review of the 36psi version = 3 stars https://www.amazon.com/gp/product/B00XCOOX68/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 Worked great on my 1999 Z24. a while but had to order a 30psi kit and also a 28psi kit to mrf specs and left 4 "backups"? The only concerns were that >they stand out more than the competition >reviews suggest their o-ring is leaking BUT I have a lot of o-rings. Rings (thanks Revain) and when installing I coated the rings and threads with beeswax THEN two flat spots = replacement part caused bolt failure = $100 store replacement including AAA visit. The metal flaws on the '99 Z24 valve stems were larger and made of rubber. These o-rings didn't really fit on these stems and even stuck to the valve stem when removed. SO NOT SURPRISE they were leaking. GOODBYE, I need this solution BUT I can't find it right now. The Z-Auto doesn't have the idiotic low-pressure warning light that the Pilot has.