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240z Tach is Working with HEI !


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Given: 72 240Z SBC swap done per JTR. Using MSD HEI distributor

 

Per JTR the 240Z tach is not supposed to work with an HEI distributor. I just ran the engine for the first time and noticed that the stock 240Z tach is working perfectly with the HEI. I used the black and white wire with the black plastic sleave to power the HEI. The other non-sleeved black and white wire is not connected to anything. I connected the green and white wire to the output side of the oil pressure switch to power the fuel pump during starting. Everything works perfectly.

 

???

 

Miles

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Does anyone have any ideas as to why a stock 240Z tack is working with an HEI distributor? The only wire hooked to the HEI is the black and white Datsun ignition wire. Per JTR the 240Z should not work.

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