The only thing I noticed that did not seem right is the stock 1 bar map and the 3 bar both read 105kpa when the truck is not running. Shouldn't the scaling be off for the factory sensor and read below atmosphere pressure? I have not had the truck running long enough to see the readings with it running.

 

I think key on engine off it should read 50kpa

 

Ok, I have just been scrolling through the forums and found this---

Since people have been asking... The MAP sensor will not work on gen 3 trucks because you can't tune for it. Only gen 4 stuff.

I am using the recommended 3 bar sensor for the holley mid rise intake which is 12592525. Does this sound like it could be my problem??