Help with install of MSD RPM activated Swithch

[spaldam]

I hooked up this switch, P.N. 8950, to some LED lights that in put in the gage console. The problem I'm having is when I hook it up to the TACH output on the ECU, either the TACH nor the switch works. I disconnected it and the tach works again. I'm thinking that it's drawing too much power from the ECU, and the ECU is shutting it because it thinks it sees a short. I'm hoping that there may be something else I didn't do right, but I've checked and rechecked the wiring diagram that came with the instructions, and I don't see anything I might have done wrong. I'm wondering if there's another location I could try attaching the TACH pickup wire too.

Any help you can give would be appreciated.

[IRL]

This info is coming late...but, if you are still looking for help...you could try to tag the tach signal from one of your coils instead.

Otherwise, MSD does offer a tach-adapter for the Celica that will make the system work 100%. I forget the part number, but if you still need help and reply to the post...I will look it up.

[spaldam]

I sent it in to MSD and had them modify it from the 12v pickup to a 5v pickup. I put it back on and the tach works find now with it installed, but the light I have attached to it still doesn't seem to want to turn on. I haven't had a chance yet to double check everything, but hopefully it's a trivial problem that will be easily solved at this point. If it's not I'm going to call MSD back and complain.

[spaldam]

Ok, I got it installed again, but it still doesn't work. My Tach doesn't die on my any more just from haveing it installed, expcet that today while I was driving around nice and easy like, my Tach starts jumping all over the place. I finally taped the RPM switch with my foot, and it stoped jumping around, so I think it's still not right, or they messed it up somehow. I think I should call them back and complain.

[IRL]

I have been waiting for my msd window switch for the last 2 months. Damn site (gofastpart.com) told me it would take 3-4 days 2 months ago...what a joke.

I "should" be getting it this week...

I am going to try to hook up the tach signal to one of the injectors...if that fails, I will further try to isolate the tach signal via diodes.

I figure there has to be a way for this to work without having to order the adapter which runs around $50-$60.

Let me know if you figure anything else out...I will keep trying on my end aswell.

[spaldam]

Yeah... I need to call them back and complain, but definatlly keep me informed and I'll do the same.