I've got a piece of kit called a Speedograph Tune Up Analyser. It has a switch for Ohms / Amps / Volts / Dwell / LoTach / Hi Tach, switch for
4CYL/6CYL and a knob for adjusting the zero ohms setting. It's got four leads - a red and a black crocodile clip and two leads that go to each end of a piece of thin metal (for amperage readings?) plus a dial for all the readings. Its probably 15+ years old
Does anyone recognise it and has anyone got an instruction booklet they can copy please? I'm especially interested in the high and low tachometer functions to calibrate a piece of workshop equipment.
Many thanks