I popped it in the rhino and the tach still jumps at idle, but is perfectly smooth when you rev on it. Only at idle does the needle jump up and down. As you raise the rpm's it is perfectly smooth in it's movement. I then put the stock CDI in and the tach needle is perfectly smooth at idle and at all rpm's.
That is exactly what I have been saying for a long time...the stock cdi is the best quality, best functioning, best starting, most reliable cdi...and the MSD just raises the rev limiter it does not change the functionality...
As for reverse...the stock cdi with msd only will pull hard when floored to 20mph where it hits the rev limiter...closer to 30 mph with a sheave...
Not to be confused with the procomm which cuts out as soon as you floor it in reverse and won't pull hard at all...
You can also put the reverse rev limiter on a switch which is basically what the low speed switch on the HW is...only backwards...that switch puts the reverse rev limiter in play in forward...you can permanently ground the reverse rev limiter which makes is the same as forward for whatever cdi you have...or you can put it on a switch like I said such that it is only defeated when you flip the switch...
The cdi you put in it with 9,000 rpm rev limiter is the Dynatek cdi...
You already have it...your tach works...no need to buy another one as long as you are happy with it...the smooth tach at idle is not worth another purchase imo when you already have to good cdi to operate the vehicle with...however, if you do care that much about the tach at idle you know how to get everything you want at once...
The starting problems I had with higher compression motor with Dynatek is why I initially switched to HW tri-fire...then went to MSD to get the tach and the starting at the same time...now I sell the MSD because I like it...
I switched to the Dynatek after tossing two procomm units in the trash...
If I was running more than 11:1 compression OR needed more than 8,000 rpm rev limit I would get the programmable MSD...just for the record I don't sell the programmable MSD either...
For most people with a stock CDI the MSD 4240 is not only the lowest cost but IMO the best option...there are exceptions...the Dynatek and HW both have their strong points...