1990-1995 GM Truck/SUV DRAC/VSSB Calibration

[eric.s.t]

I thought this was a pretty sweet and simple mod for those who want to calibrate their speedo... This sit shows it pretty clear, im going to give it a shot and try it out!

check it out!

http://www.tbichips.com/drac/

 

[95C1500]

Thanks. Tell us about it after you do it.

 

[eric.s.t]

For sure! im going to order the switch for it tonight, it takes about 2 weeks to get here. also, im swapping my '90 moonies to a '94 gauge

 

[Darkrider]

Ok what the heck does the 88-89 use for speedometer imput? Cable?

 

[eric.s.t]

Id have to say no, i personally thought it was the same as the 90... ? Looking on other forums, thats what they say. Basicly 88-91 is pretty much all compatible... late '91 they had a tach so you have to add that wire in it. But from 92-94, from what i understand, the DRAC, which is in the 88-91 is actually called a "VSSB" which is actualy external of the gauge cluster. (Moonies are inside the cluster, the needle gauge of '90-91', i think is under the dash like the '92-94) But no, it is not cable

 

[Darkrider]

Id have to say no, i personally thought it was the same as the 90... ? Looking on other forums, thats what they say. Basicly 88-91 is pretty much all compatible... late '91 they had a tach so you have to add that wire in it. But from 92-94, from what i understand, the DRAC, which is in the 88-91 is actually called a "VSSB" which is actualy external of the gauge cluster. (Moonies are inside the cluster, the needle gauge of '90-91', i think is under the dash like the '92-94) But no, it is not cable

So there is the same "lil black/white box" under the dash of my k3500 then?

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