Tic Toc Tach

badbird

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Doing a 2004 5.7 swap into a 1970 Belvedere wagon, using a Road Runner dash, will there be an issue to use the tach, will I need an adapter?
wagon#4.JPG
 

70chall440

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I think it depends on what harness/engine controller you use. I believe that the Holley harness provides a tach signal which would make it easy. A factory harness (as in one removed from a donor car) probably doesn't however I am sure there is a way to make it work via one of the MSD tach boxes or something.
 

pnora

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It is hit and miss. A lot of the time they will need a driver for the tach to work. I had mine sent out and they said with the VDO internals it should work. Wrong. I still had to run an adapter. This is with a MSD ready to run distributor. You might be better off getting the tachometer updated and then run it on the bench before installing it.
 

5.7 hemi

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MSD makes an adapter that goes on the fuel injector harness to give rpm readout.
 
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