If an ALP setup was purchased a few years ago (2-4 years), and I want to add a TX sensor, can I simply detach the existing RX head from the connector and attach the TX? Or, are the connectors different? I ask only to save some time and money if the installer doesn't have to remove the entire cable through the firewall that's attached to F2 on the CPU hidden under the dash. I'm going to replace the center heads on 2 of my ALP systems with TX sensors in the next 3 weeks. .