Need to know the model. Big difference between changing one on, say, a 387 and a 389.
It's the regular clutch position switch at the top of the pedal... the "safe start" feature is a matter of programming in the engine ECM.
Peterbilt makes Class 5 through Class 8 trucks, and the weight varies greatly between these models. Additionally, the application affects the weight - say, for example, you have a Peterbilt 330. Whether it's a single or tandem axle, what type of body it is, etc. will affect the tare weight. For a tractor unit (such as the 379, 389, 378, 359, etc.), you can expect a tare weight between 16,000 and 20,000, depending on the configuration.
A Peterbilt 389? If you really have to ask this question on here, you're nowhere near ready to take this task on. Not sure about the 389, but in a lot of vehicles, you can do this job in-frame by dropping the transmission and accessing the rear bearing that way. But I would really advise you to get a professional on this, especially if you don't have a heavy duty transmission jack, impact wrenches and sockets, and other hand tools, as well as an air source.
10 percent of 389 = 38.910% of 389= 10% *389= 10%/100% *389= 389/10 or 38.9
7 x 389 = 2723 389 + 389 + 389 + 389 + 389 + 389 + 389 = 2723
389 = 1 x 389 (389 is a prime number).
1 x 389, 389 x 1.
1 and 389.
389 is a prime number.
389 is a prime number. The only factors are 1 and 389 only.
389 is a prime number because its only factors are 1 and itself; 389.