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The 89981 tester even gives you the ability to create an RPM run and let the tester run through the RPM range
Here's the difference
If you are using the magnetic pickup input (green and violet wires) to trigger your MSD Ignition
5 in Dish - 3-Spoke - Purple Metal Flake Grip - Steel - Black Powder Coat - Each
Each model is supplied with a high-quality cap with brass terminals for full spark delivery
Aeroquip - Alum #6 90 Deg Elbow Union Black The 89981 tester even givesFitting Adapter 90 Degree 6 AN Male to 6 AN Male Aluminum Black Anodized Each
US$ 119.00
US$ 128.97
US$ 10.00
US$ 16.04
US$ 12.28
US$ 23.95
US$ 14.00
US$ 18.00