[LarryM]

I have a 1972 p1800ES that I just put a Pertronix ignitor into. It runs great, but in doing so I lost my tachometer function. I understand that these vintage Smiths tachs are current based not voltage based - but other than moving wires around, is there a known procedure for rewiring my coil that regenerates my tach function?

Thanks,
LarryMcL

 

[BHart]

What does the manufacturer say about the tach?

Contract PerTronix Product Support

The Volvo tach is an impulse tach and is very common. They should have a means of connecting this since there's lots of older domestic and foreign cars using this type of instrument.