Ralleye Tach

[sbfinne]

Does any one know how to get a stock Ralleye Tach to work off MP Elec.Ign.It works off the old dual point.I heard they make a clarifier somewhere? Its on a A-Body 70 340 Duster

[6 packin]

I think the late model ebodys that had ralley gagues had electronic ignition like the 72-73 challengers and cudas! There were however 7 Grand tachs and I belive the 70-71 were 8 grand! Not 100% though!

[bbeckwith]

I'll be interested in hearing what you find out about this. I have a 72 duster 340 and I recently scored a Rallye dash shell I want to install with my Rallye Cluster with the 6k tach. I recently finished restoring the cluster and it looks primo. I have an MSD 6a which I can plug the tach into, but not sure what will happen. I may need an adapter according to the MSD instructions.

good luck

Bruce

[sbfinne]

Its a 6000 rpm tach,and they are very hard to come bye.Thank God for E-Bay.The wire print shows just one green wire to the neg coil.A modern tach works like this,but the stock tach will not.MSD makes a tach adapter for their msd6a setup,but I dont know if it will cross over to MP elec. ign. and either do they.

[6 packin]

I have MSD 6AL which I use with a autometer tach that no tach adapt is used! Hook it up if it dont work right you know the problem!

[sbfinne]

A modern Tach works off the neg.coil. with the MP elec. Ign. MSD says their tach adapter simulates the voltage off the neg coil.Ill probly have the ralleye tach reworked with modern tech.this is becoming a hassle

[Luther]

I have a ralley dash/tach in my '70 Cuda with a Crane HI 6 ignition system. Ended up having to buy Crane's tach adapter (electronic filter) to get the stock tach to work. (Which was kind of pricey...around $40). Later on I added a Autometer tach. Again, for some reason or another, I needed to use this same filter to get the tach to run right.

[sbfinne]

I went Cranes web site.They offer 2 adapters.One is for module triggers,and the other is for mag. triggers.MP elec ign. is a mag. pickup I think,and these old ralleye tachs are current sensing.

[dave571]

I've never seen an electronic tack, that didn't work off the negative side of the coil. Even factory ones on point cars.

The old tack in your car should work. It senses the break in the field current caused by the points,or caused by the ignition module on an electronic car. The coil itself still works in exactly the same way, the only difference is what breaks the current(beaker points or a module triggered by magnetic pick up)

The msd stuff is different(adapter usually required), because the voltage to the coil is higher, and breaks many times instead of once per fire stroke.

In short, I don't see why the factory trach wouldn't work with mopar ignition, unless there is something wrong with it.

I've got a Gas Ronda signature series tack from a 69 ford that works on anything I put it on.(I don't put it on the van...ewww!)

ps. The factory tach works in my dad's 66 charger, (with add on mp electronic ignition) and it did in his 69 charger as well.

[JoeGrapes]

I replaced the dual point ignition in my '70 440 Cuda with the MP electronic conversion kit (orange box). The tach worked fine. When I went to the MSD 6AL, I had to buy the tach adapter. It's a pain and costly, but its' the only way to get the stock tach to work. Watch out though, when I used an old timming light, the one you hook up to the spark plug wire directly, I fried it. So with the MSD, use only an induction type.