chev v8 tacho problem
Posted: Thu Dec 11, 2008 10:37 pm
our chev has a HEI dizzy and a MSD ignition box thingy on it, apparently a tacho cannot be hooked up to is now because of the MSD box? can i get around this or is it end of?
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chev v8 tacho problem
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Re: chev v8 tacho problem
Posted: Fri Dec 12, 2008 6:58 am
it should still work. otherwise may need a tach adapter or something
Re: chev v8 tacho problem
Posted: Fri Dec 12, 2008 1:11 pm
You should be able to run the tacho of the timing signal. I have a CDI in mine and run the tacho straight from the cam/crank sensor. You just need to make sure it is a low voltage signal wire you are tapping into.
I've wired it this way as with the Link (POS) that I had to start with the tacho out put was low impedence and the tacho required high impedence so the ecu wouldn't run the tacho so I hard wired it. The impedence thing may have been the other way around. I now have an Autronic ecu and CDI but as the tacho was running fine I left it as i was due to the aint broke don't fix rule.
I've wired it this way as with the Link (POS) that I had to start with the tacho out put was low impedence and the tacho required high impedence so the ecu wouldn't run the tacho so I hard wired it. The impedence thing may have been the other way around. I now have an Autronic ecu and CDI but as the tacho was running fine I left it as i was due to the aint broke don't fix rule.
Re: chev v8 tacho problem
Posted: Fri Dec 12, 2008 1:58 pm
sounds too hard 
it was only for this weekend so well let the sparky do it when he hooks the TPI all up 
it was only for this weekend so well let the sparky do it when he hooks the TPI all up