the carburatted engines on these civics have vacuum lines that control everything along with the ECU, they control the warm air intake, the lean burn, the fuel cut off that kicks in while you slow down in gear, there are around 57 vacuum hoses on the DX and off the top of my head I don't know the count on the crx hf, but they are not the same, I've owned both and had them sitting side by side.
the HF tranny does bolt right in tho, if you do want better gearing, I also have a gauge cluster that came out of a 1985 civic SI, so it has the tac, it will only fit the '84 and '85 hatchbacks due to some changes in the plugs that were used, but I am told by people who installed these that it will plug right in, sadly 3 days before this gauge cluster showed up in the mail my "85 civic dx was rear ended and totaled, I think I paid $45 plus shipping for it but as it is it's doing me no good, so if you want it I would sell it for around $25 or so including the shipping, and if you need any other small parts I still have that civic that was rear ended, I would only ask enough to cover my time to remove them and the cost of shipping on them.
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