I did a lq9 swap into my 95 and for the life of me cannot get my tach to read right. I have pcm hooked up which makes it read about half. I have tried the 1k ohm resistor and a 690 ohm resistor neither of them fix the problem. No one else has any ideas I have read every TACH thread on here. And called psi who did my harness they only tell me to use a resistor. Can you help ?
You need to have the PCM retuned to a V8 signal. The 95 gauges read the RPM from the ignition coil. The new PCM outputs a 4 cylinder signal. So you get 1/2 rpm. I have the same thing and am going to get it fixed by blackbear (they did the tuning)
Psi says wiring in a 1k ohm resistor will fix it but it doesn't. I am in Oregon. And don't want to remove my pcm to send it out do you know of a tuner in this area ? Or what program is needed to fix it ?
Where are you at in Oregon?Originally Posted by rob
Salem area. Only know of tuned motorsports.
http://ls1tech.com/forums/northwest-...area-cost.html
Tom Wong is who I would go to for tuning. You can also pay a deposit for another pcm with the corrected tune and then send the one currently on your truck back to get your deposit back. Blackbear does this.
Tom Wong was going to be my suggestion as well. I'm in Grants Pass.
Thanks for the info guys I suppose I'll have to pay licensing just to have the tach fixed.. ?
And does anyone know why the resistor trick doesn't work on some tachs? The voltage changes when I add resistors but the tach reads this same
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