I don't think you need the boost fooler with the tst, it does it's own fooling. I would plug the tst in first unless you are sure the press box does
not boost fool. If the press box doesn't fool plug it in before the tst.
If I'm understanding you right you don't want to use the rp of the tst but wonder how it would work if you did want to use it? If so you probably have the harness w/o the rp option so you can't use the tst until you get a new harness that does plug into the rp sensor.
Hey no problem but I just reread what I said and I meant you can't use the tst for rail pressure until you get the new harness, not that you can't use the tst at all. Things don't always come out crystal clear when you're typing on an iPhone while driving. :bang:
Driving on a gravel road following someone doing 20mph so don't hang me for it! LOL