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I made the earlier suggestion regarding power/grounds, etc... but I'm thinking that is not the case (as you've already tested this and proven it not to be the source of the issue).
I'm now wondering about the RTek causing the issue though?? I'm assuming you had to tap into the blue/yellow wire for the tach signal for the RTek reader - or is it just reading it from the ECU directly?
The signal is usually a pulse and if there was something messed up with stock wiring system/coils, etc it would cause your tach to bounce, not just sit at a steady 500RPM, so it would seem that something in between your coils/ignition system and the tach would be TELLING the system 500RPM. And since the only thing in between is the ECU/RTek - I'm wondering if thats the problem. I'm not familiar with that version of the RTek and what settings it may have, but I'm curious if you've made ignition setup changes/adjustments against the stock settings??
Just trying to stir up some ideas....
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