Remove Rev/Speed limiter with SAFC??

[slick_s13]

Ok, so i was just doing some research on removing my Rev/speed limiter in my 90 hatch (SOHC) and from what i understand it's a pretty easy proccess...just cut the wire in ecu pin #32 and then unclip the two square clips on the trans. and your set. HOWEVER, If im using a SAFCII to adjust my AFR's wont the SAFCII not get an RPM reading in 4th and 5th? I say this because while the tach would work, the ecu wouldn't know what the RPM's are, and thats what the SAFCII will be going off of. And if it wont be able to read the RPMS, than i'm assuming that it wont know where to make adjustments to fuel at the set RPM's. Causing me to potentially blow something up? i have yet to put the turbo in because i am waiting on a wideband to come in the mail, but i was just wondering because it seems asthough this would be a problem....

Thanks for any help,
-Donnie