Years ago I pimped out my CUCV Blazer with a silverado gauge cluster. All I did was de-pin and re-pin the plug end and follow the path on the circuit board finding the proper gauge.
You might try removing the glow plugs (10mm deep socket) and try to turn it over first.
Don't be surprised If the plugs put up a fight coming out.
That will determine step two.
Trying to tune up a JDM mini truck with a carb and points distributor.
My analog dwell meter is for 6 or 8 cylinders. Would I half the 8 cyl. reading for a 4 banger ? Would that be the same for a 3?
Find a different inspection station. I may know of one in the 508 area code.
Read up on Mass. 540CMR 4.04 (10)(d) there is no mention of how they work, only that they must work.
I haven't been able to find out what/who's bulbs I used and I don't have the truck any more. I kinda remember the bulbs had a built in resistor, not sure it was a few years ago.
You may try to put the bulbs in 180* and see what happens.