Here's the entire kit for $39.95 on Amazon: www.amazon.com/GoolRC-Digital-Narrowband-Volmeter-Modification/dp/B09ZYJLK6N

Or you can pull a used O2 from a pick a part yard and there are lots of choices of guages for around $20: www.amazon.com/ESUPPORT-52mm-Fuel-Ratio-Gauge/dp/B00SMJ0BTQ

You would need to test the used O2 before installing it which is simple. YouTube has plenty of videos for that.


Master, again and still