Hey everyone - I wanted to take a moment to give a quick update. I was able to get the unit working. I kinda followed Robbie's advice - I started checking the afore mentioned wires with a meter and found a couple of things. I found that the park brake ground connection was faulty / intermittent. I spent the better part of an hour, and had to run an additional jumper to get the park brake switch a better ground. I also found that the connection for the tach signal was flaky. While the t-tap connector pierced the insulation for the coil wire, it did not pierce the insulation for the wire back to the remote start. After connecting these 2 items, the remote start functions as intended. One observation that I did make, is that during remote start that the radio does not get power, which is not a big deal. I checked through my haynes manual to try and determine if it was due to a faulty connection, but could not determine how / where the radio gets its power. Lastly, I've found that the park brake switch / ground is still intermittent at times. Has anyone else seen this and have a suggested fix? Let me know. Thanks for the advice, everyone!