I've been wanting to do some more testing on this stuff, but haven't had a chance lately. I seem to recall the 4 pulse from JTR not working with a DRAC/VSSB, so the two pulse might be the better option and that should be what the '8747 ECM is looking for anyway. I wouldn't do the driveshaft sensor since the 2 pulse should do the job. Call JTR before ordering and ensure they have it in stock, I think I waited about a year the last time I ordered a 2 pulse prom them. I'd stick with the ARPA as that is setup for the injectors that you're using.