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Jeep Wrangler YJ
YJ General Discussion
Speedometer Calibration?
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<blockquote data-quote="machoheadgames" data-source="post: 426533" data-attributes="member: 18789"><p>All NP231s come from the factory with gears. Super Short SYEs like he showed us make the transfer case so short that it eliminates the gear because there is no longer room for it.</p><p>[ATTACH]116161[/ATTACH][ATTACH]116162[/ATTACH]</p><p></p><p>To be annoyingly technical, speed sensors from 1991 and later are ALL electronic on Wranglers. The old CJs used mechanical speed sensors that spun a cable which spun the speedometer. The YJ continued trend from 87-90. The 1991 YJ brought out the MPFI 4.0 and 2.5. The PCMs needed speed signal as a result. The 1991 model still had the older dash. So for 1991, a hybrid sensor combined a speedo cable adapter with an electrical signal generator. The signal was sent to the PCM and the cable still spun the speedo.</p><p></p><p>1992 brought out a new dash gauge arrangement with an electrical speedo. No more speedo cable. This speed sensor still used a gear, it’s just the gear spinning the speed sensor generates an electrical signal which is sent to the PCM and the speedo. The speedo raises the needle accordingly.</p><p></p><p>Early 1997 TJs used the same sensor as 92-95. Late 97 switched over to the new style because the plug connector on the 97 and prior style leaked ATF up from the transfer case which would get into the electrical contacts. They fixed that for the late 97 speed sensor and all NP231s for the rest of the TJ had it. They were all still electrical though. The Rubi reports the same thing but since it’s just a fixed sensor, it needs a calibrator. The exact same calibrator can be installed on speedo gear Jeeps. It will still recalibrate the electrical signal it receives from the speedo gear input exactly the same.</p><p></p><p>All that said, Speedohealer doesn’t make Jeep harnesses anymore, so that’s less of an option unless folks want to make their own wiring harness. I would recommend a Dakota Digital since Blue Monkey stopped selling the Speedohealer kits for Jeeps.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 426533, member: 18789"] All NP231s come from the factory with gears. Super Short SYEs like he showed us make the transfer case so short that it eliminates the gear because there is no longer room for it. [ATTACH]116161[/ATTACH][ATTACH]116162[/ATTACH] To be annoyingly technical, speed sensors from 1991 and later are ALL electronic on Wranglers. The old CJs used mechanical speed sensors that spun a cable which spun the speedometer. The YJ continued trend from 87-90. The 1991 YJ brought out the MPFI 4.0 and 2.5. The PCMs needed speed signal as a result. The 1991 model still had the older dash. So for 1991, a hybrid sensor combined a speedo cable adapter with an electrical signal generator. The signal was sent to the PCM and the cable still spun the speedo. 1992 brought out a new dash gauge arrangement with an electrical speedo. No more speedo cable. This speed sensor still used a gear, it’s just the gear spinning the speed sensor generates an electrical signal which is sent to the PCM and the speedo. The speedo raises the needle accordingly. Early 1997 TJs used the same sensor as 92-95. Late 97 switched over to the new style because the plug connector on the 97 and prior style leaked ATF up from the transfer case which would get into the electrical contacts. They fixed that for the late 97 speed sensor and all NP231s for the rest of the TJ had it. They were all still electrical though. The Rubi reports the same thing but since it’s just a fixed sensor, it needs a calibrator. The exact same calibrator can be installed on speedo gear Jeeps. It will still recalibrate the electrical signal it receives from the speedo gear input exactly the same. All that said, Speedohealer doesn’t make Jeep harnesses anymore, so that’s less of an option unless folks want to make their own wiring harness. I would recommend a Dakota Digital since Blue Monkey stopped selling the Speedohealer kits for Jeeps. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Speedometer Calibration?
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