I did not test beyond this—did not hook it up to a muscle car or anything.
Vintage Dwell Tach Tester Model R-11 Kal-Equip Co Untested
VINTAGE Dwell-Tach Tester 6 Cyl Engines- 8 Cyl Readings Balkamp model 4-4700
Dwell Tach Tester Lumen Lua-430 Tachometer Vintage In Original Box w/ Manual
Vintage Kal Equip Dwell Tach Tester Model R-11 RPM Gauge Automotive Tool USA
Vintage 1950s SUN Model 24020 Dwell Tach Tester 6-12v USA untested
Vintage 1950s SUN Model G1494 Dwell Tach Tester 6-12v USA
