The knock sensor bolts into a bracket in the center of the V which in turn bolts to the block.
Only high compression blocks are machined for the bracket.
Early Mitsu knock circuits are analog, later are digital.
The sensors are different for each. I have not looked up exactly when the sensors changed.
Frank, it may be possible the later sensor would be compatible with KS.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.