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Username Post: Wiring tach to hei        (Topic#361410)
Posts: 34

Reg: 10-01-17
06-17-20 02:38 PM - Post#2796597    

I am in the process of wiring a Bosch Sport II tach to my 1965 Impala SS. I purchased an accel pigtail to go along with the installation. My question is, do I have to run the red wire from the tach to my fuse box ignition source, or with this pigtail , can I just run the red wire from the tach directly to the pigtail on the hei distributor labeled batt?


"3rd Year" Gold Supporting Member
Posts: 152
Loc: Brevard, NC
Reg: 05-14-18
06-18-20 05:14 AM - Post#2796631    
    In response to 65DJF

If the red wire is "Pwr In" when key is in "On", I'd think any pwr source that is only hot during "pwr on" would be just fine... +12V is +12V


Mark - Brevard, NC - 66 Impala SS RestoMod
>>My detailed build thread link <<

"5th Year" Silver Supporting Member
Posts: 1760
Loc: SE North Carolina
Reg: 08-19-04
07-04-20 08:46 PM - Post#2797922    
    In response to MarkISS

Don't know about different HEI units but mine has two connections for the pig tails. One is for Batt(12v) and mine is wired to IGN at the ignition switch).

The other connection on the HEI is for the tach and, logically, it goes to the tach. The tach can also get its 12v from the IGN terminal. There may also be another 12v input on the tach for the lens lamp and it should likely be wired to a source that controls the interior lighting.

Note: The connectors at the HEI are identical, although to distinguish them properly they are typically different colors and usually come with different color wires. However, Classic Industries (at least) make a one piece two wire connector, that when properly installed, will eliminate the chance of later plugging the tach lead into 12v.




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