<VV> Oil pressure sending unit

[NicolCS at aol.com]

Many S-W gauges run in the 40 to 270 ohm range.  NAPA lists a sending unit in 
that range with a 1/8" pipe threat fitting.  It's OP 6657.  If you can put 
your hands on a variable resistor or selection of resistors, hook up the gauge 
and select a resistance where the gauge indicates "zero" and then select 
another resistance where the gauge reads at maximum.  Record the resistances and 
take them to NAPA to match up a sender. (NAPA's catalog has the values.)

The values for an OP6657 are: 
0-3 PSI = 227-257 ohms
3-7 PSI = 146-219 ohms
40 PSI = 83-123 ohms
80 PSI = 22-51 ohms

Craig Nicol

<snip>Hey All;

   I have a Stewart Warner 0-80psi oil pressure gauge that was purchased off 
of eBay for my Corvair engine. Would anyone happen to know what sending unit 
I should get to get this gauge to work (or have any idea where I can get 
this info)? Thanks.

GaryB in Prosser, Wa. <unsnip>