Do you want to trigger your Holley HP or Dominator ECU to activate a transbrake rev limiter when the transbrake is active?  Smart move!  But before you simply split the transbrake activation 12-volt signal to an input on your ECU realize this:  When the transbrake is released a flyback voltage will be generated.  This voltage can be far in excess of what the 12-volt input on your Holley ECU can handle, and will damage the ECU.

This damage from the transbrake flyback voltage can easily be avoided with this handy Transbrake Input Protection Module!  This module clamps the voltage and protects the ECU.  And it's super-easy to install.  The line to the ECU even comes pre-terminated with a pin.  Simply identify the input you wish to use and insert this pin into the connector at that location.  Tie the red wire to the high current side of the transbrake solenoid and ground the black wire--you're done!

Note: If you are wanting to implement transbrake control on the Sniper EFI System then this is not the transbrake input protection module you seek! Instead, read this article and use this High Current Solenoid Driver.

 
Instruction Sheet
Holley EFI Transbrake Input Protection Module