1999 T600. Jakes, cruise and high idle not working.

Hi all, recently picked up a 1999 Kenworth T600 with a 12.7 Detroit and a 10 Speed. Previous owner told me that he thought I needed some sort of module to get the jakes, cruise and high idle to work. Most everything else on the truck works great except the fuel gauge (which I'll also address soon). It may also be worth noting that the speedo is a bit lazy (while accelerating, it sits at 20 for a few seconds, and jumps to 40 and seems to work fine after that). Should I be looking at this mysterious module or is there a sensor or somewhere else I should be looking at first?

Any advice or first-hand experiences would be greatly appreciated. Thank you.

 

Thanks Nasriza, I'll get a look at that tomorrow and report back with what I find. Take care.

 

Thanks Dave, gives me something else to look for.

 

Well, one thing is apparent after crawling under this thing, I need a manual.

Other than that, there is only 1 sensor at the back of the trans.
Also, I moved the clutch pedal up and down and it is definitely returning all the way and I can hear the switch catch and release as I take up the free play by hand.

Anyone have a good source for manuals?

 

Thanks Dave, but the pedal is coming up fine and the switch is opening and closing.

Nasriza, would this 2 pin plug be at about the 1 to 2 o'clock position if viewed from the rear? I have one there that has one round pin and one flat pin. Looks more like a temp sensor to me.

Also up for discussion: I found 2 wires that are about the perfect length to go to the Fuel Sending unit and I'm sure this is where they go. One wire is brown and the other is white. Anyone know which one goes to which pole on the sender? The sender also has a round and a flat connection but the ends of the wire have been clipped.