I’m remembering past discussions.
Not saying the tach is faulty (except maybe the bayonet connection - disconnect it and the car will not run) but this …
The thing about using an unsuitable fuel filter is the accumulation of dirt where you can’t see it, If on the inside of the filter, the dirt gets stirred up and temporarily blocks the flow of fuel and the engine stalls. Allow the dirt to settle back into the bottom of the filter and fuel will flow again, until the cycle is repeated.
If you use use this filter in place of the GF124 without reversing flow, then dirt will be trapped on the inside. There would also be a tendency for the filter to be pushed out of position by the flow
and
It’s like the GF149, but since the flange has been omitted, the filter is held in place with a spring. it’s really not a great solution. The spring makes installation cumbersome. Dirt is trapped inside, rather than outside where it can be seen
There’s also the possibility of dirt getting past an inadequate fuel filter and finding its way into the float chambers.
More info here: