A couple of years ago, I made a post identifying a superior -and much lower cost- Measurement Specialties Products (MSP) transducer as a replacement for the Honeywell MediMate transducer that the VMS 1000 employs for fuel pressure indication. Some tried to use that same transducer for oil pressure and reported that it didn't work, yielding a value twice the actual oil pressure. Here's why:

The 50 psi Honeywell unit that VMS employed for fuel pressure has a 50mV full output, which equates to 1mV/psi. The 100 psi MSP unit that I recommended has a 100mV full output, which also equates to 1mV/psi; so it functions perfectly as a replacement for *fuel pressure*.

The 100 psi Honeywell unit that VMS employs for oil pressure also has a 50mV full output but, in this case, that equates to .5mV/psi. With it's 1mV/psi output, the same MSP unit will not function for oil pressure; it causes an indication double the actual oil pressure. 
As stated in my post a couple of years ago, the Honeywell MediaMate is older and inferior technology, prone to failure, and -at over $400- is outrageously priced. In contrast, the MSP unit is compact, superior and modern technology at only $120.

There's another, almost identical MSP unit that has a 50mV full output and, consequently, will function perfectly for fuel and oil pressure in it's 50 and 100 psi versions. Here's the spec sheet: http://www.meas-spec.com/downloads/US300.pdf

Problem is that the combination of it's 5VDC supply voltage and 50 mV output is rarely utilized in industry, so there aren't now any available. However, I contacted one of MSP's distributors and they appear willing to place an order for the 10 unit minimum, provided that there's interest.

Let me know if you're interested, even to purchase one now for future use if your current transducer should fail.

 

Bill Rumburg

N403WR  (Sonic bOOm)