Need help with Sunpro boost gauge on my 1987 Turbo supra... i have a GReddy boost controller but i don't want to interfere with it, plus almost all my vacum lines are missing and the one on the intake manifold is looped back, i will have a pick soon... plus the line they give you in the package is Crap... i live in Tampa/Riverview so anyone who can come show me how to do this is much appreciated ...
Again, sorry to revive such an old thread.. trying to figure out what the P/O did with this boost gauge.. I have a feeling its a cheap gauge from Autozone or something, but I don't know enough about gauges to know for sure.. But the problem is when I am at idle, it shows upwards of -20lbs and when I accelerate it will come up to about 5-8lbs.. Not sure why it shows negative 20 at idle, and then I am not sure if I am actually running 5-8lbs or more to get it to that point? Here is a quick vid showing the P/O plumbing under the hood..
At idle you're not actually showing negative lbs of boost, you're actually reading vacuum, which is in inches of mercury. so "-20" would be 20 in/HG. From what I've seen on my other turbo vehicles, >20 is perfectly normal.
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