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INSTALLATION ODDS & ENDS

INSTALLATION ODDS & ENDS

NVU TECH DEPT. on 25th Aug 2021

GM Drac Module

Previous to programmable speedometers the drac module was in place in many GM vehicles. Some of these modules are capable of reusing the speed signal that went to the factory speedometer. This signal Can be used on your NVU speedo, drive a mile will give the most accurate reading On the speedo.

Diagnosing GM DRAC Diagnosing GM DRAC

Integration with Holley Dominator, Sniper

NVU instruments are capable of using the speedo and tach signals from theses systems. The newest Dominator X MAX only outputs a PWM signal which is not compatible with NVU Instruments. There may be a pwm to analog converter on the market to make use of this signal.

Holley EFI 554-114 Dominator EFI ECU

MegaSquirt 

Speedo and Tach signals are available on most systems. These systems are very programmable And may be capable of being more plug and play with our kits with some more research on the sending unit signals offered via the program.

Amazon.com: MegaSquirt MS3Pro PnP ECU Engine Management System Compatible  with 01-05 Mazda Miata Manual : Automotive

1ST Gen LT1 Speedo Signal (VSS)

This requires a 1k resistor to 12 and wired up off the signal wire similar to the way an LS. This will pull that open collector signal over to a hall effect and get things working. The tach signal Is good right off the computer on these.

 Top White 10 pin
|K|J|H|G|F|
|A|B|C|D|E|


G is DK GRN/WHT and is vehicle speed signal.




Voltage changing rapidly 

Check vehicle grounds as one missing or loose ground can cause the digital voltmeter to react instantly. This is not a gauge issue but one where ground Is not correctly connected allowing voltage to leak. • A good set of grounds is the most important thing a vehicle can. No matter if it’s carburetored or and LS crate engine.

Ford PSOM module 

The Ford psom was installed on late ‘80s and 90s models of the Ford trucks/vans. This module is important to the vehicles function as it communicates between the ABS sensor and the four-wheel drive to the speedometer which acts as the brain of the operation. • Good news we can reuse the speed signal that was going to the original gauge cluster, simply follow the diagram and drive a measured mile calibration and you will be set.

 Ford F250. with Late and Harsh Upshifts THE NUTS AND BOLTS OF ELECTRICAL  DIAGNOSIS. The First Steps. by Mike Van Dyke and Chris Ondersma - PDF Free  Download

MUSTANG 64-66 REPRODUCTION BEZEL

Uses 4 of the OEM fastening points

Bend the lower tabs inside the dash opening about 45 degrees toward the driver to secure the two screws.