Hey,
I am a mechatronics engineer with skills and hands on experience relevant to your project.
First of all, I have rarely used freelancer.com and want to revive it., You can view my upwork profile for credentials.
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Now i got a bit confused by your description.
My understanding of the project is this.
Read OBD data from bike ECU > transmit data to Garmin via BT
Now i was going through your material and i could not find the part where BT is used to transmit data to garmin.
We can interface Maxbotic Sonar to existing Arduino Uno, so you can share existing Arduino sketch with me.
Also, i could not find Garmin BT interface/protocol. Do you pass OBDII PIDs directly into Garmin via BT? If that is the case do inform me which OBDII PID would be used for Maxbotix Proximity Data.
Once you explain the project schematics to me, i can code dummy value to emulate Proximity Sensor. Once you get those dummy values as per your need, i can code the maxbotix sonar with it.
You can see my arduino related experience in my upwork profile. I have also worked on OBDII diagnostics project using CAN2USB modules and CAN2SPI ICs in my university.
Looking forward to listen from you,
Regards, Ali