Tic Toc Tach

[badbird]

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?

 

[70chall440]

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]

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]

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

 

[392heminut]

The MSD Hemi6 controller has a tach feed wire and would work.

 

[69ChargerR/TSE]

MSD Ignition 8920 MSD Magnetic Pickup Tach Adapters | Summit Racing used with my Hyperspark, similar to the MSD controller. It works.