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Q21-6005 is the sensor, there is an extension cable (you dont need now, you changed plug) p92-6972 That sounds like our KW here,oh here the computer says..... I want the olden days from 20 years ago when you had real parts guys that you walked in, and before you could get the part out of...

I dont know why it would be different, unless KW did a substitute. The 2 that I got from KW were exact fits, and functioned correctly

Take your mpu to Kenworth, tell them you need a speedometer sensor for an 03 kw w900 with an 18 speed, its exact including the plug

Another description for the MPU is a tachometer for the computer. Yes we could enginerd some way to produce 2.5vac, but that would only tell the computer that the engine is cranking at 300rpm. then when the engine starts the MPU produces (pretend b/c I have never measured) 4.1vac at 1300rpm...

Here is a video, this is not of a 805, but the process of testing is exactly the same. As the video shows, my mpu needs to be adjusted. https://youtu.be/fb0fmCUZj7Y

mep 805b mpu diameter .75" 03 KW 18speed tranny mpu diameter .75" Plugs looked exactly the same as well, the KW mpu appeared shorter, but it does have a very beefy bracket that it mounts in.

VAC= volts AC my guess is the mpu was on its way out and the good mech skrewed it in to get the volts needed, and was too close and rubbed just a bit if the parts house looks at you funny, tell them an 03 kw eaton fuller 18918b,i am pretty sure thats the right size, Kw, not peterbilt, petes...

if it ends up that mpu is bad... its not an endall, those are an easier part to find. A big truck parts house will have them, they are used as speed sensors on the tranny. Just get the right diameter and thread pitch. There is nothing special about the mpu, it is a magnet that says, yes no yes...

Screw magnetic pickup (4, Figure 4-30) into flywheel housing until pickup bottoms out on flywheel. Back magnetic pickup out 1 1/2 turns. Tighten locknut (5). Adjust magnetic pickup (4), 4.13.3.d. Set multimeter for VAC, and connect multimeter positive lead to terminal B of P13 and negative...

page 384 in the -14. set at 2-3v.

That should be the first step of any jenny trouble shooting..... coolant low? check the magnetic pickup... rod sticking thru block? check magnetic pickup