Another Tach Question. (Did search first!)

Thanks. Let me know how yours turns out. I'd like to have the tach working from the PCM output as well... eventually.

Does the needle flutter throughout the RPM range or is it just at idle?
Most aftermarket tachs are much more sensitive than a factory unit, and thus will pick up small changes in RPM which results in a flutter on the tach.
Mine flutters at idle mostly d/t the cam, but once the engine comes up off idle, the needle smooths out.

The majority of the fluttering is mostly during idle. As the needle advances through the RPM range is smooths out a bit. However, it never gets entirely smooth. I don't have a manual shift transmission, nor do I have a shift light. I use the tach mostly for engine management. So it works for my purposes.

beater6.0, I just found this. I'm going to try it this week and i'll let you know how it goes.

Fixed Tach... YES!!! - LS1TECH

thanks trunknuts did u try it i will be at radio shack tommrow morning beating there door down

well i just got done at radio shack got the resistor and hooked it up to an aftermarket tach and guess what it worked so im all giddy like a school girl.

Just got home from trying the resistor and what do you know? It freaking works! I spent $80 on a crappy tach adapter and a 99 cent resistor fixed my problem. Go figure...

thats sucks. glad u got it fixed im happy mine is finally working

beater, how did you wire your check engine light? I have the brown/white wire from the pcm going to the ground side of my light. The other end I have going to an ignition powered 12V wire. It won't light up when I go to start the engine, but I know it works cause I tried to start my truck today with a low battery and when it slowly cranked, the light turned on. Am I wiring it wrong?