When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I am a bit confused, I have wired in a gm map sensor and made a +12v to +5v converter for it and that works fine. I have an issue going from the map sensor to the lw tuner. I keep getting 36.698 and not the actual pressure. Could my ground be wrong? here is the current full diagram of how it is layed out.
Well as you can see "A" is the ground but it is currently wired to the lw. maybe I will hook up an eyelit and see if attaching the ground to the vehicle changes it.
Pretty sure it should be grounded independantly.. Not positive, it's been awhile since I've piggybacked one of those.. The hose is nice and snug right? And you're sure about the 5v reference being good?