Ernie, airplanes with a serial number 1726 or less, use an E Type. The only way it wouldn't is if a later model indicator was installed at some point in its life. In that regard, the part numbers for the "Indicator, Power Economy" are:
- Through SN 1726 - C668502-0107
- SN 1727 and up - C668503-0101
Serial numbers 1727 or greater, use a K Type. My airplane is #1795, so it uses a "K". Center Line Aero used a
Alcor-Tempest 86255 from Aircraft Spruce as a replacement and yes, it responds appropriately within the range markings of the gauge. I've attached a snip from my invoice.
As a note, the indicator was an option on SN 1671 or less. It was not required equipment to identify an engine failure.
I cannot comment on the generic leads other than it should meet the resistance/ohms of the appropriate type, E or K.