Stock speedo with holley terminator x max

[charlesgray85]

Does anyone know what pin you use to get the 4000 pulse signal in to make the stock speedometer work. I have the output turned on in the terminator software but have tried a few different pins and none of them have worked. Any advise would be appreciated. Thank you

 

[The_Family_Tahoe]

I have plans to run the x max with stock gauges like you. It looks like you have the 97, which I think is similar to the 99 obs black box cpu and gauge set. I'm watching this thread and thanks for posting the question.
How are you liking the x max for control of the efi and transmission thus far? Any mods to the motor?

 

[charlesgray85]

I really like the terminator. Very simple to install and change parameters if you decide to upgrade something later on. I put a raylar 203 camshaft, roller rockers, modified intake, and 80lb injectors.

 

[Komet]

The factory service manual knows. It was a BLU / BLK wire coming off the DRAC in my '92.

 

[Scooterwrench]

If you are using an earlier DRAC that would be pin 4. 4000 PPM normally is used for cruise control.

 

[The_Family_Tahoe]

The factory service manual knows. It was a BLU / BLK wire coming off the DRAC in my '92.

What is DRAC?

 

[Komet]

What is DRAC?

Little white plastic box that takes in VSS signal and sends other signals to the speedo, cruise control module, etc. Not sure if they exist in Vortec trucks.

 

[charlesgray85]

They only used the DRAC up until 95. I will try to hook it into one of the other speed signal and see what I get.

 

[charlesgray85]

Got it figured out. The speedometer does work on a 4000 pulse from pin b5 on the firewall connector. Thank you for all the help.