7.3 questions before upgrading

[enoyes12]

I have an early 99 (3/98) and I'm running the Evo II, MBRP 4" turbo back, DIY intake, FPR mod and in process of making my own version of the turbomaster waste gate arm. My first question is I have an elevated idle on any tune but stock on the Evo (approx. 200 RPM). It's driving me nuts when sitting at a light the exhaust has a low hum when on the brake at a light. If I put it in neutral or park and rev it up it will drop back to normal then at the next light its back. Put it back to stock and no elevated idle. Will upgrading fix this?
Next thing is that after buying the Evo I find out it won't read the trans oil temp in the '99-'00 trucks. That was one of the reasons I went with the Evo, was to monitor the temps. Talked to Edge and they told me they could not get the trans temp to be accurate with the early PCMs. Will doing a PCM swap fix this issue? I would really like not to have to add a gauge pod for the TOT. What would the cost be for the upgrade and new tunes?

Thanks