There are several optional features you may want to use.
TBI ECM TOOLS INSTALL
To do this, install the MAP sensor, but bend pin 1 so that it does not go into the hole (the hole will be jumpered to SPR3).
![tbi ecm tools tbi ecm tools](https://troubleshootmyvehicle.com/images/articles-500-599/570/570/image_1.gif)
This one goes straight up and will bolt to case rail.
TBI ECM TOOLS FULL SIZE
Some examples include full size trucks from 1988 to 1992 with the 4.3 V6, 5.0 or 5.7 smallblock, or the 7.4 big block. GM TBI adapter board (currently available in bare PCB form) allows you to install MegaSquirt into GM trucks with the ECM part number 1227747 and cars with ECM part number 122746.