Without seeing it and measuring the inside dimensions, I couldn't really say if it'll fit, but my gut says yes. The ERR Cruise Commander fit into an Atlas RS3 for me. It was a tight fit, but it's in there. The TAS smoke unit would need 16 ohm dual resistors to be compatible with the diesel upgrade kit. I've seen people parallel these inside the smoke reservoir, and I've even done it a couple times myself.
Worst case for the tach reader you dispense with the holder and glue it to the motor directly, that wouldn't require any extra space.
It's really not possible to say all this works for sure without actually having the item in hand.
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