Speedo correction for 98.5 and up

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I have oversize tires which cause my speedo to under read and perhaps affect other electronics such as the ECM. Has anybody any experience with a device called an Electronic Pulse Ratio adapter. This is supposed to correct the number of electronic pulses generated by the vehicle speed sensor. Are they easy to install? Where can I get one? How much do they cost.

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Keith
'99 24v 2500 QC 4X4 AT 3. 54

 

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Check out http://www.abbott-tach.com/era.htm
Andy

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'97 CC 4X4 5-Speed, on cover & page 91 of TDR issue 24.
Be sure to visit Northwest Custom

 

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I installed the Abbot unit on my 1998 2500 back in Feb. '99 and has it has worked fine. My speedo/odo readings, as calibrated by interstate mile markers, are much closer that the original setup with stock tires. My stock setup read too fast/too many miles by about 2-3%.


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David Edwards Austin,TX
1998 2500 4X4 Reg. Cab 12V NV4500

 

[Archive]

Keith,

I installed an Abbott E. R. A. 6 months ago to correct the speedo/odometer readings after installing LT295/75R16 tires. Everything read about 8% too low. The installation takes about 30 minutes and requires you to locate and splice into one of the speed sensor wires. The sensor is located on the rear differential and the wires run as a twisted pair up to the engine compartment. Several folks have recommended putting the ERA in the cab instead of the engine compartment to keep it out of moisture prone areas. The device cost $117 when I bought mine.

The only installation issues are finding the right speed sensor wire and a place to hook up to a switched power source.

Mike B.

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'98 RAM 2500 4x4 CC LWB Auto 12v 4. 10s Intense Blue, Sport, TST Power Kit, TCS Converter,
TransGo Diesel Shift Kit, M/T 16x8 Classics, BFG AT LT295/75R16, PIAA 90 Pro, ISSPRO Boost,Pyro,Trans Temp
'98 Texas Bragg 20' 12,000# GVW Tandem Axle Utility Trailer
'97 Jeep Wrangler Sahara

 

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Andy. .
Thanks for the info re: Abbott. I've been looking for someway to recalibrate my speedo. Have been stalling off on larger tires/wheels because of that. Now I don't have to procrastinate anymore.

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'99 Ram 2500 QC 4x4 Shortbed SLT A/T ISB5. 9 Cummins
K&N, Westech pyro/boost (more equip in the works)

 

[Archive]

Thanks guys. I'll call Abbott in the morning.

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Keith
'99 24v 2500 QC 4X4 AT 3. 54

 

[Archive]

You might want to call the guys at Rickson. In talking to them at the Nationals, I think they sell cheaper then direct buys from Abbott and they have corrected the installation directions to make them work well for the various Dodge applications.



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Rob Spading
TDR Webmaster

1996 Dodge 3500 CC, Cummins, 4X4, Loaded SLT, Mag-hytec diff and trans covers, Rickson 19. 5s with Cooper C140s, Westach pyro-boost-trans temp, etc. , etc.