HEI tachometer

[78Suburban]

somewhere I stumbled upon on the net yesterday, it said that if you had HEI that some tachs wouldn't give an accurate reading. Is this true? I have an on cheapy sunpro tach on my old '66 truck that just attaches to the negative side of the coil. I was considering taking it off that truck and putting it on the burb, attaching it to the "tach" terminal on the dizzy.

So will this tach work correctly. The thing I read said that even if the tach was giving you a reading, some tach's simply wouldn't be accurate with this type of distributor. If this one won't work, what will?
thanks.

 

[pauly383]

Should work fine , I have a Sunpro on my 83 with Hei .

 

[big83chevy4x4]

i have not heard anything like that. mine works just fine, mine is also a sunpro.

i do know if you hook the tach up to the HEI and have a MSD box, it will throw it off big time, but you are suppose to hook it up the the msd box instead of the distributor.

 

[trailblazr81]

Ive done it with no problems... Then I got a MSD 6AL and used its tach output.

 

[monster man]

my tach worked when I swapped on the HEI- it's an AutoMeter. BUT, it gives some WACKY readings sometimes, when I turn the lights on and have a turn signal going, or if the sub woofer is drawing a lot of power for bass, the needle jumps with the bass hits. I've tried seeing if bad grounds or connections were causing it but have never been able to track it down.

 

[4xcrazy]

my tach worked when I swapped on the HEI- it's an AutoMeter. BUT, it gives some WACKY readings sometimes, when I turn the lights on and have a turn signal going, or if the sub woofer is drawing a lot of power for bass, the needle jumps with the bass hits. I've tried seeing if bad grounds or connections were causing it but have never been able to track it down.

hell, my speedo needle does that,, well, when the bass hits anyways