Untested, but likely works.
Vintage Sears Penske Dwell Tachometer - 244.21013 Sears & Roebuck
Vintage SEARS PENSKE Dwell Tachometer 21013 In Box & Owner’s Manual
Vintage Sears Penske Dwell Tachometer #244-21013
Vintage Sears Penske DWELL TACHOMETER Model 21015 Untested Used
Vintage SEARS PENSKE Dwell Tachometer 21013 In Box UNTESTED
Vintage Sears Penske Dwell Tachometer 244.21013 Manual 4-6-8 Cylinder USA
