Aftermarket Crank angle sensor

Wouldn't it be easier to adapt a crank sensor from a late 5S or 3S motor?
You can buy the oil pump etc cheap which is made for crank sensing



I have seen it done a few times

 

cam sensor has more resolution, the trigger is the bolt as you see one is different from the rest.

 

I doubt that, the crank sensor mounts to the oil pump and the mark/s are on the crank pulley which is the same diameter or bigger than the cam pulley.
Also
1)the cam pulley turns at 1/2 the speed of the crank
2)the cam pulley is affected by cambelt tension and elasticity
3)the cam can't be degreed without moving the pickup as well
4)recently we had a case of "stray misfiring" due to the pickup sometimes reading the other bolts as well - took weeks to find the fault

 

1)slower speed = easier to sample
2) the entire engine rotational mass suffers "tension, and elasticity" : harmonics ; further more you can argue that the tensioner acts as a further dampener to reduce the cam disturbances
3) not an issue with an EMS as you can resync the sensor, after the cam is degreed it does not need to be changed
4) due to improper design, this is not a design I would use.

Caldina st215 has the cam sensor pickup and is highly accurate.
slower turning can achieve higher sampling rate

Wouldn't use this set up on a street car, but im just saying