3 prong 3.2 tachometer help....

[LAPS INC.]

I purchased this from a fellow member for a 914 3.2 ltr conversion. Below are pictures and we're trying to sort the wiring but all diagrams we find are a plug with 6 pins. Is this a 84-89 3.2 Carrera Tachometer? I bought this tach from a forum member and it was a great transaction. It does not have an upshift light and only has 3 pins in the plug All I've seen and the only wiring diagrams I can find are 6 pin below are pics any help/clarification would be helpful! Thanks.

[tmaull]

So far no images.

[LAPS INC.]

I didn't think that this was posted the first time sorry. I couldn't get them to load from my phone for some reason I just reposted from my computer above.

[LAPS INC.]

[tmaull]

Looks like a date code on the rear. I can't quite read it. I'm not sure when they changed to the shift light. My SC does not have one.

[Flat6pac]

The shift light was put in in 1984.
With the six prong plug I is very late 80s.
Bruce

[LAPS INC.]

So far I have found 3 three pronged tachometers that people have and all are marked as 84-85 model years does anyone have any additional info on these? I am putting it into a 914/3.2 conversion and if it is NOT a 3.2 tach I have been told (and have experienced it. On 2nd Ecu) it can damage the ECU. Any additional info would be appreciated.
Thx