Looking to purchase some gauges and trying to determine the range on the boost gauge for the LLY 05s. My CTD will produce 32 psi max.

SO what will this Duramax do with either the edge or predator?:rolleyes:



**2005 CC, SB, SLT, Sun Roof, XM, Headrest DVDs, and soon to be bombed.
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Well the LB7 will produce 28 or so, I think the LLY is in the same range.

Yes this would be nice to know as I have the same truck and I am torn between going with an edge with monitor or the predator which seems to work better with the LLY according to the forum. I would prefer to not get both (edge & Pred) right away unless good gauges are that expensive that it justifies the cost to get both. Back to the guages issue, how high to go for boost, as I see some go up to 60 psi and what are the most problem free?

My O4 Lb7 With No Mods And Unloaded Was 22. Dont Know What It Was Loaded, Didnt Have Guages In Yet.

I would go with the 60 psi gauge. I have seen 36 psi with the juice/*** alone. This is from a gauge tapped into the intake, not the Attitude monitor.

dmcmerth- Go with the Pedator and a set of gauges, you will be much happier. The end price will be close to the same also.

Manually installed gauges are not as accurate as say the attitiude monitor being that reading is taken right from your trucks computer. My LLY goes to 29.2 psi, but that might be all that the attitude reads up to.

Before I got rid of my attitude, I saw 31.2 as my highest.

I'd say 40psi gauge should be all anyone should need. I don't think we'll se the Garrett VNT take off and make super boost any time soon.

SPA digital is also a good choice.

I'd trust a good mechanical gauge just as much or more than the calculated boost from the data stream on the Attitude.

How important is a boost gauge?
I have an EGT gauge. Will be towing an 8000 lb trailer, stock truck - for now. (no box, stock exhaust)

How important is a boost gauge?
I have an EGT gauge. Will be towing an 8000 lb trailer, stock truck - for now. (no box, stock exhaust)

For what you have now.........not verry

GM supplies the trucks with a 3 bar sensor so that will be the limit of what any plug in box can read unless they add a new sensor. 1 bar = 14.7 psi. You need to remember the factory sensor is an absolute gauge reading so at sea level you are already at 1 bar reading with the engine off. So at sea level the max reading can only be 29.4 psi from the factory sensor. A stock truck will make about 21 psi of boost loaded and one with power adders will make more.