Stretch,
The injector I am talking about is a Bosch
From my notes~


the no.1 injector. check connector with a multi meter, i think under 80 ohms is good.

Injector #1 0986430248 or 0432217249 maybe 0430211091 or 0432217249
IDZ1023 equivalent to 15 06 2022F, 15 06 2026F There are 2 different blow pressures ~ 150 & 165 bar

KCA30S82 boschowski number is 0432 217 246

0432217303

GERMANY 060 KCA 30 S 82 369 150

You can probably google some pics. It detects the pintle moving. As I posted previously, its inductive so the combustion shock shouldnt effect it.
I suspect if you were to grind the side off an injector so there is less metal between the sensor & the pintle. A RF style sensor like used to be used in radios etc may work.

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1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving