what happend whith map sensor when see boost, do i need a missing link or not,stock ecu

 

where the turbo guys are

 

What year and engine is this?

 

jeep 4.0 1.989

 

This one uses a Rennix EFI system with a GM type 1 bar MAP sensor. The sensor itself isn't capable of seeing beyond 1 psi or so of boost - it hits its maximum voltage at that point. So, if you don't switch to a standalone ECU, you'd need some way to add more fuel and pull timing when the ECU doesn't see the boost.