I've got a '87 TurboII in a car thats not an RX7. I am using stock ignition/coils etc.(and a Haltech E6K) I have a vintage VDO tach that worked on a turbo Corvair ('64, 6cyl) and a VW ('74, 4cyl). I can't get the tach to work. I took a lead off of the trailing coil and get a signal off of it when I use a multi-meter, and the signal increases as the rpms increase. Has anyone run across this before?

 

where'd u have the tach hooked up before? i remember hooking mine up to the alternator i think.

 

Thanks for the reply, but the alternator is in the charging system and has really nothing to do with the tach except to make sure that the tach has a supply of 12volts from the batt to run it. I haven't had the tach hooked up to the turboII before. I've been reading rpms off of my laptop/Haltech E6K

 

You have to set it up for a 4 cylinder. Some Tachs have 4cyl, 6cyl

 

nah i dont me from that one charge wire, i spliced a wire from it, dont remember where it went, but it gave the tach a signal i used the ignition as a power supply tho.

 

I've tried the 2,4,6,8 cyl dial on the back of the tach. I'm getting a signal from the trailing coil and it increases as RPMs go up, but its not driving the tach. The tach is set up for a car with a points ignition system and this is electronic. (1978 tach)

 

On using the alternator as a signal source, I stand corrected. While going over a VDO gauge web site I found that this could be done on diesel engines.