What 4 Bar MAP Sensor for MS3 PRO?
 

I have a GM 3 bar MAP sensor, but need a 4 Bar. Who sells a good 4 bar MAP sensor with connector? This will be for a MS3 PRO so external sensor.

New GM 4 Bar Map Manifold Pressure Sensor Turbo Boost with Wire Plug Pigtail | eBay

I found this one on ebay, but it's a no-brand part, no idea if it's junk or a good part. DIY doesn't sell a 4 bar for the MS3 PRO, I already asked them if they had one and they said no, but they would make a note for the demand and consider it as a future product.

Does anyone else have a rec for this? I've been looking for something official-ish, but I've mostly been running into no-name ebay ones or 100 dollar ballenger ones. Wondering if anyone has a part number for an AC Delco one or whatnot...otherwise I may just get the 3 bar for now if I can't find anything legit.

You can (or used to be able to) order the mpxh6400 from digikey/mouser and in the mapdaddy kit from diy. It could be a little harder to integrate, but NXP pressure sensors are legit.

I don't have experience with the 4 bar but as a heads up when you buy the sensor make sure you buy the pigtail specifically for the 4 bar. Although the pinouts are the same on all the GM MAP sensors, the connectors are keyed differently.

I ended up buying a 3 bar from DIY for better resolution and I'm going to use the 2.5bar in the ECU for baro correction. I doubt I'm going to be pushing over 30psi anytime in the near future, if ever haha. DIY also sells the MAPDaddy one that replaces the stocker in the Megasquirt.

If you're looking for a GM style one, then it appears as though ballenger has some: https://www.bmotorsports.com/shop/pr...oducts_id/2134

Additionally, there's a brand called OMNIPower that seems to make them in the US. I was going to get one of theirs on ebay because i had a 15% off sale thing yesterday, but chickened out because I'm not ballsy enough to save 25 bucks on a sensor this important and have seen tons of knockoffs on ebay. Looks like a few reputable tuning sites carry their sensors so it should be all good.
Here's the link to their official site though:
Store | omnipowerusa.com

I'm gonna correct the resolution comments you keep making: on a good quality modern map sensor and good quality modern ecu, I have yet to see any ill affects from 4bar vs 3bar. at all. If someone has, you got my attention, please share.
I say this because you make it sound like 4bar will have bad resolution and create issues. If you don't need it then of course go for the 3 bar, just don't make up issues out of thin air.

resolution =/= sensitivity

Yup. They were the same price. Even if sensitivity is the same, why not get the one with better resolution if one isn't going to be using the last 1V of the curve. Thanks for the clarification all the same!

:facepalm: