2Tracelab wrote:Connect a wire to the RH ignition coil and send it to the pulse wire of the mc28 tacho.
The wire will trigger the mc28 tachometer.

This sounds great! I've got a PGM IV with 010 & 030 HRC cards and 2 std cards, but the PGM won't make the tacho work. The PGM's a spare and I'd always assumed it was kinda junk! It's sat in a box for 5years!

It sounds like I might be able to get it to 'fire' the tacho using a separate wire to the RH coil. I assume you mean the coil to the lower cylinder?