Revcounter not working after new built

[KamikaziCaddy]

Hi Guys

I’ve been building the past 16monthe on my Caddy project, 1989 model with a 2E longblock motor fuel injected, started with the MP9 but pulled it out Saturday and fitted a Dicktator STD, but since day 1 the revcounter dont work, I’ve got a 3 pin coil.

I used the enjin loom of a 1991 Citi for the front from the fuse box, I did cut out the TP100 wires but left the red wire with a black tracer aka revcounter ?. So when I connect the bluewire with black tracer from the dicktator to the red wire with black tracer my revcounter still dont work, i disconnected the wire and sometimes when I swing the enjin the revcounter jumps and stop again.

Any suggestions what I can look at next ?

Any advice would be appreciated.

[PapaJo]

The blue/black wire from Dicktator is the correct wire on Dicktator side.

The red/black wire is the wrong wire. Back trace from your rev counter side to the plug connecting to the cluster the wire and then find the colour wire.

[panic-mechanic]

Red black is traditionally the correct rev counter wire. But it needs coil negative for ththe old clusters ie something in the vicinity of 220 v not the 5v the dictator puts out.
When you use a 3 pin coil thee is a little plastic above the big connector and there are two terminals sitting there. The one side is 12v and the other is the coil negative. You can connect it there.

[KamikaziCaddy]

Thanks Stephan, I did do that and it picks up when I rev it, but on idling it just stays on 0, but once I rev it over 3000rpm the buzzer comes on.

[KamikaziCaddy]

Sorted out the buzzer now, but revcounter only work when I rev it and not on idling, it just picks up from 0 barely and stays there. Any advice ?

[KamikaziCaddy]

But on that 2 connecters above the 3pin plug the revcounter works on the positive only.

[panic-mechanic]

Then there is something wrong with the revcounter

[KamikaziCaddy]

I’m doing those dialkits, think I’ve maybe put the revcounter needle on wrong maybe.?

[panic-mechanic]

possible.

[☆KalaMK3]

I believe you require a tacho adapter for it to work. I had one fitted to my 60-2 setup as the signal from the ecu is square and not sinusodal

Sent from my SM-G610F using Tapatalk

[PapaJo]

1989 Caddy and 1991 wiring loom still use the old spec dash and rev counter is square wave

[panic-mechanic]

on the old counters it's all about voltage.. 5 v just don't do it.

[PapaJo]

In your first post you mentioned TP100 and cut out wires, meaning the distributor signal as this is now going through the Dicktator std. You are still using the TP100. Connect a wire between pin 7 on the TP100 and your rev counter black/red wire and you are sorted. Then you have a 12V signal to rev counter.