Thanks. It is high for sure, but it never lasts long. Like you said Nemo - it's much worse when the truck sits for a while and is cold.
I'd have to double-check the exact numbers, but it's at the top of the green bars on the controller, which I thought was 14.6. They all light up, and then the controller blinks and the alarm sounds. After a short period, all is well and it calms down.
This didn't happen when I ran this same system in my Tacoma, but obviously that's not a realistic comparison.
1976 FJ40 - green and mostly stock
1996 FZJ80 - not so stock