You don't have to, will work just fine without a reflash as long as you don't crank it down so tight you get into an "over boost" condition.

The dealer wouldn't know what to do in the program other than turn off error reporting for the over boost dtc anyways. In my experience, they won't even do that because it's altering the stock program. Thats a big "no-no" for factory authorized technicians.....

Heath recommends a TM with his re-flashes iirc. He did when I bought mine from him. Error reporting is turned off and the fuel tables are "tweaked", amount other things....

I have also flashed my own programs into my PCM. I have the software, hardware and "tuning" knowledge to flash 6.5 obdII PCM's.....it didn't come cheap either......


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I plan to build a turbomaster, remove the vac pump as I think it will fail one day anyway, (it uses HP too) I'm going to add an LED to the vac WG solenoid to act as a "shift indicator" or a "reminder to back off on the throttle to save fuel" idiot light.... With the fuel prices these days every bit helps...... This should work well with a 5 speed.

 

The wastegate solenoid uses a PWM signal, it's not on or off.

A PWM signal to an led will make it brighter or dimmer, but not on or off.

To compound issues, the stock vacuum program calls for different pressures dependent on several difference factors, so brighter or dimmer won't even give an idea of manifold pressure.

Get a gauge. If you want a warning light, get an auberins.com digital gauge. It has a signal out trigger that with run an led, relay, buzzer, etc and the on/off threshold is user programmable.

I have auber gauges, work great:



You can also see in the picture my photoshopped "idiot panel" which has a light for boost (gauge is programmed to light it off at 13psi) and a light for egt. It also has things like wif for my prefilter, wmi water tank level, fuel pressure, trans temp, etc. Each triggered by the appropriate gauge. Here's the real panel in progress :











A little "amateurish", but it works and gets the job done.

I have since completed it, although this is also a ps pic:



Panel saved my bacon more than once towing in the rockies. I could watch the road and just keep my foot in it until the lift went off. I knew right away when the egts were too high without having to stare at the gauge all the time.

Careful though, once you get one gauge in there you're going to want more:



Little bit of ps there too. Cb is installed like so:



And the wmi controller ate up the space for one gauge in the lower panel.




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I have gauges. Like you I want to build indicators of what is happening and not have to focus on numbers when an LED will do. You have a neat setup!