Based on Lucio's experience we addressed few aspects of firewall penetration and passthrough locations. 1. Penetration for AWG2 wire to starter contactor. Changed the position compared to the original drawing to allow use of steel passthrough. 2. Penetration for Engine Sensors : using two large avery passthrough positioned on the top of the firewall away from the oil filter to allow easier replacement 3. Penetration for Cabin Air Heat Valve: Lucio will prepare a passthrough with angled tubing. 4. Penetration for Manifold Pressure sensor not required as Garmin Sensor will be positioned on the VA-168 Sender Mount using the available slot (one for oil pressure, another one for fuel pressure and the last for manifold pressure) 5. Replace Fuel Aluminum fitting with steel fitting (same shape) AN837-6 steel 6. Grounding block for ring connectors on both sides of the firewall 7. Grounding block for ring connectors on the sub panel. Connect with AWG8 to Firewall grounding block?