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#1
11-22-2007, 12:21 PM
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Speedo and Tach Not working WHY??
electronic speedo and tach in my 90 Grand prix LE 3.1L (not digi) my rpm guage maxed out over max when i turned car off and stuck there and then the speedo doesn't move at all, i hit the dash to make the rpm guage go back to 0, i hooked up a comp to it and ran a data stream test , and found that the idle rpms are at 150 and when u rev it, she drops to 25 rpm (impossible)
 the crank rpms reads 5 rpm idle and when u rev it she reads 1 but the speedo in the computer says it is working properly, but does not show on the CLUSTER.  i have alrdy checked the ECM for voltage from the speed sensor and going to cluster and also checked connectivity, and i have a signal at the DIS, and was ok PLEASE PLEASE HELP ME
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200 Hp Quad 4 H.O. W41 Cams + Prom, Rebuilt Motor 90 Cutlass Supreme International Quad 4 HO 5 SPD 91 Grand AM SE Quad 4 HO 5 SPD 92 Grand AM SE Quad 4 LO 3 Spd Auto Last edited by Blaze_316_316; 11-22-2007 at 06:02 PM. 
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