Alternate CHT Sensor
Washer type (under spark plug) - MFR is Westach (Westberg)
RMI EGT Replacement Sensor
Grounded type K thermocouple, tubing clamp style MFR is Westach (Westberg) Part number 712-2DWK
RMI CHT Replacement Sensor
Grounded type J thermocouple, 3/8-24 bayonet style MFR is Westach (Westberg) Part number 712-7DK
All Above from:
Westberg Mfg., Inc. - 707-938-2121
Wicks - 800-221-9425
Aircraft Spruce - 800-824-1930
Manifold Pressure Sensor
2-bar MAP sensor from numerous auto parts stores. The following are all compatible.
Online source: bmotorsports.com. Their sensor number is SNSR-03066: Delphi/GM 2 bar MAP sensor. They also have a connector number CONN-75559: GM Delphi/Packard 2&3 bar MAP sensor connector kit.
EGT/CHT Multiplex Switch
This is the 4 pole, 6 throw, two section switch that we have always stocked. Digikey.com part number 451-1061. Mouser.com part number 690-D2D0406N.
Oil & Fuel Pressure Sensors
These are the VDO sensors (with two wire connections) that we have always used. Both are available at egauges.com. Oil pressure: 0-150 psi (0-10 bar), part number 360-430. Fuel pressure: 0-30 psi (0-2 bar), part number 360-043
Outside Air Temp or Oil Temp Sensor
This is an integrated circuit sensor AD590-JH. Digikey.com part number AD590JH. No other sensor compatible.
Carburetor Temperature Sensor
The original design was to use the Richter B-5 sensor (originally $25 now about $300), if you can find one. We designed our own. If you wish to build up a sensor yourself here is the internal sensor: an RTD from Digikey.com 615-1037 apx. $19. A copy of the mechanical drawing that we used for the housing is here if you have the mechanical skills.
Water Coolant Temperature Sensor
H2O temperature into CHT position on display using either a 3 inch long adjustable-depth thermocouple for insertion into water jacket through a 1/8 inch NPT or 1/4 inch NPT adapter (compression type fitting, install adapter, insert thermocouple to desired depth and tighten nut) or a non-adjustable one-piece thermocouple with 1/2 inch nose.
OMEGA - 800-826-6342
The microMonitor has a float charging circuit built-in for the following batteries.
Try Local Motorcycle Shop or
Mouser Electronics - 800-346-6873, part number 547-PS-1212, about $18
Pressure Switches for user alarms
A pressure switch can be used to activate any one of the three user alarms on the Monitor to warn of low water pressure, low vacuum etc.
World Magnetics - 616-946-3800 for catalog