it won't hurt to get the larger mapsensor, however since you're stock and if you were going to really up the boost beyond 11ish then you would probably be running a built motor at that point which would more than likely not be the same compression as stock anyway. however, either way is fine.
for dallas, since his motor is already built the larger mapsensor would really help since it'll be good to go for 15+psi already.
i run my oil feed out of the stock press sensor area. bspt-npt nipple, to feed line, to t mounted on the firewall (no stress at all on block and same fitting/line for 6.5yrs). stock pressure sensor is relocated to the t on firewall. sandwich plate is fine too.
bspt-npt fitting can be had @ summit and a lot of auto parts stores.





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