I put a holley blue on this weekend and it boosted my fp to about 25psi at idle. But when I am going down the road the guage constantly flips back and forth from 20 to 30 psi very very fast and rattles really loud. Anyone have any input on the best fix? Isolator maybe? thanks

 

You can buy a snubber from a number of dealers that will absorb the pressure Variations and prevent the shudder! Olee Poole keeps them in stock!

 

The Holley comes with a rubber isolator to be used when mounting! Atleast mine did.