RDAC XF and XF MAP Reference Ground to Engine Block

The RDAC  XF and XF MAP Pins 5 and 9 on the DB9 connector are connected Directly to Engine Block Ground

Note: It is acceptable to Setup a Ground Bus on the Firewall where all of your senders that require an Engine Block Ground are Grounded. This Bus should be wired to the Engine Block with very heavy gauge wire, and you can then use it for Grounding your RDAC Ref Ground and all sender Grounds that do not Ground through the Block itself, as in this example (shown with an older RDAC model):

Important: Read this articleon why an Engine Block Reference Ground is critical for accurate engine sender readings. If your oil temp, oil pressure and RPM / tach engine senders are not reading correctly, this is the first thing to check.

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