I have it working for cylinder head temp and transmission temp connected to a 2006 production year F53 (3 valve engine and 5RXXX transmission). Your coach will be using CANSF coding but the older F250s might have been on a different the protocol (PWM). Verify the data you entered against what Linear Logic is recommending (
Ford Specific XGauge Programming). Very easy to make a mistake, took me a few times to get mine correct. Same applies for setting up the Gauge to pull the data from internal memory and convert it to an understandable format for display. If still no joy after verifying everything is correct call Linear.