@Bobalos more pics to clarify.
I took the exhaust brake vacuum pump off when I changed the water pump last week. Haven’t towed in 5yrs, stopped working 2yrs ago. Without the vacuum pump you run the factory length belt. Around $250 for the exhaust brake vacuum pump. Long belt shown with pump.
gauge pod, air bag controller (switch stopped working so added the little round one) and the brake controller